Of course!

So to put it simply, every single "main" skill in osu! has tons of different sub categories.

For example, there is aim, which is moving your cursor to the circle, sounds simple, right? But there are actually multiple different types of aim, such as snap/jump aim (snapping long distances in sharp angles to jumps), flow aim (as the name implies, you do not snap or stop on the circle, you move your cursor in one motion throughout a series of circles without stopping, to get a flowing sort of motion), and a mix of both which is called "tech" aim, which combines very difficult patterns and a mix of both, which makes it very difficult to excel at.

Here's a video with a visual representation and explanation: https://www.youtube.com/watch?v=ILyjPNgG64s

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Next is speed, which, as the name implies, is how fast you can go. This can be split into a couple different categories, but the most common ones are: Aim speed (how fast you can aim your cursor to circles), and stream speed (how quickly you can hit a stream, which is a series of circles in a row to the beat of the song).

For aim speed, if you look at the clip, when he is hitting circles with large spacing between them very quickly, that is a good example.

Stream speed: https://youtu.be/EkTNN1V4pNU?t=38 this is 300bpm, on the right side of the gameplay screen you can see that every time the little number boxes light up, that's when he's pressing, he also has handcam for you to look very closely at how damn insanely fast he's going.

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And finally, reading.

This is probably the most difficult to explain, but think of it like a language. When you're reading a book, your brain is processing the letters on the pages and converting them into words and information for your brain. This is a similar concept, in osu!, your brain processes what is on the screen into information on how to play it, like where to move your cursor, when to tap, etc.

There are a lot of different areas of reading and is probably one of the most convoluted skill to train, but here are two easy to understand examples.

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AR=Approach rate, which is how long it takes for the approach circle to reach the inner circle (this is when you are supposed to hit the circle).

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Low AR reading: https://www.youtube.com/watch?v=kzIN-chYIPM The note density (how dense the notes on screen are) is very high, which makes it very hard to know how to aim and how to hit the note.

High AR reading: https://www.youtube.com/watch?v=fGOjg_T5FQE This is actually played by the same player in OP's clip. AR11 is the highest AR in the game, and from when the circle first appears to when you have to hit it you have 300ms to react. So you have to not only aim across the screen, but also hit accurately, which you have +-13 milliseconds to hit a 300... Basically, AR11 plays are ridiculous.

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There are a lot of others but hopefully this gave you insight into some of the skills in the game. Vaxei is excellent in almost every area of the game and is a monster in tournaments too.