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I've done 3d player movement but can't figure out how to do 2d.

What kind of movement?

General movement (jumping, moving etc)

I have watched the brackey's tutorial but it doesn't really make sense, I also can't find out what the unity input system is and how to use it

Also, I don't have enough money to buy a udemy course

So you mean platformer movement? I think there is a platformer controller already in Unity if you import the 2D asset pack.

Yes, I have done that but I cannot understand what they are doing.

This is a good tutorial for 2D platformer movement.