Crouch Boosts and vectoring, it isn't really recommended for a first run, and crouch boosts are mostly only used for ILs

Wrong, crouch boosts are used in RTA, they aren't as often as of now due to players needing to get used to them, but in the Wii U wr they are used.

vectoring is basically just moving diagonally in the air and it gains more speed and crouch boosting I'm not so sure on but I think it's just crouching for a few frames when you hit the ground or go over a ledge

[10:03] QRL Storm: My way of doing crouch jumps involves mapping one of the crouch buttons to X on the pro con. I then flick between X and B once I have enough speed and if timed right and done quick enough you should get a good crouch boost. It is important you only use one finger/thumb when doing this though else you will long jump by pressing both buttons at once. Hope this helps guys 😄

My way of doing them pasted from the discord server. People say that this method tends to work for them so good luck