Xeric Shrubland / Semi-Arid Shrubland are a bit weird.

Adding to the confusion is the fact that Xeric and Semi-Arid Shrublands tend to be right next to eachother, as the only real difference I know of is Semi-Arid gets a bit more rainfall.
You'll find creosote and mesquite in the Chihuahua Desert, Regular Mexico, and you'll also find both in the Basin and Range area, New Mexico. And also there's some overlap with what exactly counts as the Basin and Range and Chihuahua Desert, like for example, the entirety of the Tularosa Basin (El Paseo up to Carrizozo), which is where I grew up.

"I realized that what I had made was essentially just a funky funhouse mirror map of our regular Earth."
Just rotate the map and nobody will notice. (I speak from experience.)

As a worldbuilder myself, I look forward to seeing what you have in store for the future. Your channel seems like it has quite a bit of potential

Not sure if you took this into account but a useful thing to remember is that their tends to be more moisture on the ocean/sea side of mountains, this is because as air rises in the atmosphere to go over mountain ranges it is less able to hold moisture and so most water precipitates out before it gets to the far side. Sounds like your map is pretty much set at this point but it’s something I always try to keep in mind when making maps.

Have I ever told you how much I despise traveling through deserts? I have been taking Steppes to avoid them.

Wonderful video, and that art you made personifying the mammoth steppes and taiga biomes was way too cool, took me completely by surprise!

For anyone else out there trying their hand at this kind of realistic worldbuilding, I HIGHLY recommend Artifexian's series about the process. It goes over everything in as much details as you could possibly want, and he makes the science pretty easy to understand.

1:35 "-Because you're insane" this is true as a person who draw maps as a hobby and who plays map painting games (Paradox Interactive games)

@6:00 I like how you noticed also that you made an earth clone and didn't just gloss over that. There are very successful earth clones, off the top of my head best are Warhammer and Dungeons and Dragons, Game of thrones is also an earth clone but hidden much better by never showing the whole map at once. This is a great vid even if you didn't know the science :D

Hidden Gem of a channel.

If anyone is looking for a real whimsical-forest biome to set their story in, I recommend Temperate Rainforests!!! They're genuinely so beautiful and look straight out of a fantasy film

"The hobbit amd THAT OTHER ONE" I love that quote

As much as I like people going insane over biomes, keep in mind that folks dedicate their whole life learning about it just to do mortal combat with their peers to have a fleeting feeling of being right, until somebody else comes over and disproves everything they stand for.
Normal people call things by what they think they are, and historical people cared even less. For them, every grassland may be a steppe, or maybe the entirety of africa be a desert, and don't know what a savannah is because they never heard the bloody word.

Easiest way to make something logical is to have an elevation map, a heat map, a wind map (usually coriolis winds are enough), and a percipitation map (which you may base on the previous two).
Basically, biomes are the combination of the geography, the local temperature and water content.

Regarding Water:
-Rain happens when moisture containing hot air (being lighter than cold air) goes up, then as it cools down it's moisture retaining capability is diminished, resulting in the excess moisture percipitating and falling down the ground (basically the moisture turns into clouds or fog, then water).
-Clouds form over bodies of water, such as seas and oceans, and via winds they are spread over landmasses, depositing their water content along the way. Landmasses that are mostly flat and don't slow the winds down usually don't have lasting rains, and thus are more barren.
-Fogs happen in high moisture areas and during the early morning and evening, when hot air is first introduced or moves out of the picture. They get trapped within mountains, so rainy season in basins is also foggy season.
-Rivers come from mountains, by either them retaining rainwater in mountain lakes, dolinas and other features, and then said water trickling down, or if they are high enough the snow on the peaks can just melt during hot periods, resulting in cold, clean rivers.
-Rivers also merge, and never split (naturally, though exceptions occur). Big rivers are fed by a bunch of smaller ones, and they carve their path in the landscape. They also like to change place throught the ages, especially if they seasonal (those that shrink or dissapear in dry season, and flood in wet season), moving on the other side of villages in a couple dozen generations.
-Deltas are not rivers splitting, it's actually the sea/ ocean water depositing silt and whatnot at the end of the river, which in turn extends it, as the water tries to flow around the created banks and islets. It doesn't happen at the end of every river, it highly depends on where the wind blows, and thus where the waves go relative to the river's end.
-Lakes appear when a river is slowed down enough, or if multiple ones merge in a low area/ basin. Their size highly depends on the size of the rivers feeding them, and some are so big they are called seas. Since rivers are dynamic, as the millenias go on even the largest of lakes can dry up, leaving behind soil full of clay. Lakes also have rivers coming out of them towards seas/ oceans.
-Coastal areas may have inlets created from changing water levels. These are not lakes, as they have direct access to seas/ oceans, and are also salty themselves. These may also dry up and leave behind salt flats.
-Salt water lakes are actually parts of seas or oceans that got trapped as the sea levels decreased. They may also eventually dry up and leave salt flats behind, though the length of this process is heavily dependent on the amount of rainwater it gets. Such lakes may also be fed via rivers, and may feed rivers going to the sea/ ocean.
-Marshes happen in two cases: It's either a coastal area that is relatively flat, and thus experiences seasonal or occasional salt water floods, or it may be next to a river or lake that floods seasonally or ocasionally, covering large amounts of land in water that will eventually dry out. They rarely form basically as low depth lakes as well, but that's very rare.

Regarding Elevation:
-Mountains happen on the boundaries of tectonic plates, their size dependent on how long these plates have been interacting with each other. The himalayas are big because the indian and eurasian plates have been messing around for so long. The philippine isles are so underdeveloped because the philippine and sundra plate interaction is relatively fresh.
-Their types are also indeed dependent on what type of movement is happening. Collisions produce inert high elevation mountain ranges, divisions create volcanic mountain ranges, and rifts create inert low elevation mountain ranges and plateaus.
-Mountains are the prime "rain catchers", responsible for retaining moisture in a given area. They have a wet side where the winds are blowing from, percipitating their moisture, and a dry side which barely gets any waterflow. Both sides are viable for rivers, but it's usually the wet side that has more and biger ones.
-Mountains are thusly also where a lot of plants grow, particularly tall mountains having multiple types of biomes that would be normally be separated by hundreds of kilometers, simply because the higher parts are colder and rockier (such as having a snowy peak, then rocky band, then grasses/ mosses/ lichens band, then a band of shrubs, and lastly bands of trees of varying thickness).
-If the area is hot, mountains may be of more bearable temperature if high enough, but if the mountain is in the midlle of a large landmass and/ or is being "shadowed" by another mountain range from the prevailing wind direction, they may become rocky mountains  bereft of moisture, and thus vegetation.
-Rocky mountains may also form on the dry side of mountains in particularly hot or cold areas, if they are more "horizontal", and reach deep into the arid parts of the landmass.
-Lastly, rocky mountains may also form if they are steep enough, such as if they are mainly made of limestone that is heavily eroded, or if they are on a major subduction zone. Basically plants just don't have enough "grip" on them to proliferate.
-Plateaus are just relatively even mountains that may have really deep canyons carved by rivers. They often form at continental rifts, and are heavily dissected by rivers.
-Fjords are mountains that have been "carved" by glaciers, thusly they are located at the northern and southern hemisphere, where such glaciers formed. They are basically coastal mountains with steep elevation and often no foothills, that are also featuring a lot of canyons where the sea itself moved in the wake of glaciers. They may have islands separated from the mainland, which eventually will be broken down by sea/ ocean waves. These are really good places for shipbuilding btw.

Regarding Plants:
-Trees need lots of water and different types grow everywhere, though they don't like strong winds on flat terrain.
-Shrubs are okay with medium amounts of water, and are more resilient to winds, and may even utilize it to proliferate over large areas.
-Grasses, mosses and lichens need minimal minimal, give no damn to wind, and in fact the basis for many animal's diet. Grasses need a lot of sunshine though, so cloudy areas or under thick tree canopies is moss and lichen territory.
-Fungi need dead matter to grow, so wherever is life there are fungi as well to break it down when dead. They like caves a lot though, since a good number of species are averse to light, and none of them need it.
-Algae grows in every body of water, though the more it moves the less there is (so strong rivers have low amounts). It needs sunshine though, so only the top part of the water gets algae "infested".
-Kelp grows from the ground up, so only continental shelves have them, where the water isn't that deep. They also blot out sunlight, so algae and kelp forests are usually mutually exclusive (though exceptions occur).
-Land where there is barely to no water is where deserts are. They still have some extremophile species in there, but the theme is generally low amounts of biomass in a given area.

Okay, this is basically all I have from the top of my head. It's a lot, but it's still way less than doing your own research, or watching 3-6 youtube videos detailing each type of biome and where to put them (again, you don't need to know what xeric shrublands or montante forest means, if you know where shrubs or trees grow in general).

This video can probably teach you as much as 3 years of high school geography in 18 minutes.

Personally I’d solve the funhouse mirror earth by literally flipping it around as if being viewed through a mirror. Actually now that I think about it, flipping the world around and warping the terrain would make something mostly unrecognizable to all but the most eagle eyed viewer and would feel crazy unique…

Good video! I know more than a layman about this kind of thing, so a few bits of added context:

The reason coasts often hug the tectonic plate lines is because there are two kinds of crust: Oceanic and continental. Basically, continental is like oceanic but with a bunch of lighter rock and earth (stuff other than basalt) piled on top. If a continent splits, the new crust is oceanic, since there's nothing on top of it. And if a bit of plate that's got continental crust meets a bit that's got oceanic, that also forms a coastline (and the oceanic subducts beneath the continental, pretty much always, as it's denser). Another feature of this distinction is that continental plate forms bigger mountains such as the Himalayas (which are still forming) and the Rockies (which are not as their plates have fused, and they've since worn down). On the other hand, those formed when a oceanic plate meets continental are smaller and tend to be volcanic, as they're formed when crust that falls into the mantle melts and floats back up.

With regards to the mountain standing by itself in a flat place, this can happen in real life, although it's quite rare. The most famous is Hawaii, which is a chain, but it's formed from a volcanic hotspot that the crust has been drifting over. But the individual mountains are spread out enough that it's not highly visible because of sediment and water obscuring low parts.

Wind and weather patterns can be complicated but there's a simplified version that's pretty accessible imo: The convection cells formed by the Coriolis effect. Basically, alternating bands of pressure (and, therefore, precipitation/humidity) according to the way that the air swirls as the planet turns. It boils down to: Put a band of mostly desert at about 30º north and 30º south, skewed a bit in either direction if you want, and the poles are also dry while the tropics are wet. The only other big thing to keep in mind is orographic precipitation, which is that the mountain squeezes moisture out of the air (by pushing it up and therefore decreasing its density and pressure) so you get a lot of rain on the upwind side of mountains and then not so much on the downside side. The same coriolis gyres I mentioned before tell you which direction is usually going to be upwind, you can google a diagram and just look at where the arrows point. They don't account for small-scale variation but you can easily get away with ignoring that or making it up
Oh also seasonality can shift things north or south a bit but that's just because the earth's axis is on an angle, and the air isn't directly attached.

All biome classifications are subjective and fuzzy, so I'm not surprised this part threw you a couple snags. It seems like people think in terms of biomes more now than they used to when I was coming up (I blame Minecraft) but while it can be a useful lens, it's important to remember that biomes are just frameworks developed by humans to classify groups of ecosystems, mostly to allow us to apply knowledge from one area of the world to another. When you're writing your own stuff, they're a good guideline but if you understand a bit of the basics of how temperature and water quantities interact, you can design your own environments for narrative purposes and not need to worry about matching up specifically to environments that exist on Earth. After all, look at the Fynbos – A unique biome that exists in just one small area. If something by chance can be that rare, it only stands to reason that there are possible biomes which by chance don't exist at all. No reason why your world can't have similarly unique biomes if conditions allow.

You had the science pretty well figured out for someone without a background in it overall, but there's always more to learn for people who want to. Of course, when it comes to world-building, you can always subvert these ideas. Maybe there's no tectonics, because some gods put the continents in their place – but then if real hydrology and weathering are applied to those landforms, it still makes an interesting and varied world.

I adore the image at 11:18. What a wonderful way of depicting biomes!

tundra: cold desert
alpine tundra: very cold and windy, rocky and mountainous
sub-alpine forests: same thing but less harsh, with more vegetation
taiga: cold, usually at lowlands around mountains, and has a lot of vegetation
montaine forest: usually found on highlands, becomes more spaced the higher it gets. can be found in any climate
tempered forest: mixed forests who everyone already knows.
tempered step: windows wallpaper. gets too hot and too cold
dry step: like the tempered but worse
arid desert: basically sand and little dry vegetation
shrubland: dry like the desert but with a lot more of vegetation
mediterranean: a mix of a lot of biomes like in mosaic. doesn't get too cold, and has a wet and dry season
savannah: either composed of forests or grasslands. it would be a tropical forest if it weren't because of the fires in the dry season
tropical dry forest: stays warm all year round, but still has long lasting dry seasons
tropical rainforest: very warm all the time, and receives tons of rain all year.

Such an underated channel! Very thoughtout videos! I would love to read your story.

The only reason I was watching this because my character goes to school and they learn about geography so I need a world map

Some of the most popular fantasy franchise plagiarise plain old earth blatantly (e.g. Warhammer Old World, Song of Ice and Fire) so don't feel too bad about your map! I saw "Afrifa" but the rest felt totally unique. That point of reference isn't bad, but actually helped reading the map.

A fun little tip: Work on little areas at a time, then, as you get better, GET BIGGER!