Instead of dashing to the right, suddenly going left for 3 frames, then up, then a, you turn your joystick clockwise from right, to down, to left, to up then a. Instead of right -> neutral -> left -> neutral -> up, you rotate to input right -> down -> left -> up. There's no theoretical advantage, it's just that for some people the timing is easier that way.
You obviously need to press a after up, since you can't usmash while running, you can only cancel your jump (which you can do while running) with an usmash. I mean this is common knowledge, but the usmash timing is the same as a dash usmash and not as a standing usmash.
Another obvious thing, but maybe it's worthwhile keeping in mind: the teleport length depends on how long you wait holding the back direction before jumping.
Just had an idea: we could easily find the timing of various things and make a video with something beating at that specific rhythm, maybe it could help? I was thinking of SHDL, teleport usmash, shine jab, that kind of things. Tell me if you guys think it might be useful.