First of all how to do the two most important glitches:

Super Jump: (You need Energy) Hold L2 and press "Square", then at the right moment press "Triangle" and "Circle" (Note: You can change Size during the Jump)

Infinite Dashing: (You need Energy, but it won't consume it) Hold L2, hold the right control stick into the direction you want to dash and spam "Circle".

Now to the skips:

There are a lot of small time saves in areas where you have to get somewhere that is just slightly higher than Knacks normal jump height. In nearly all of those cases it is possible to use the Super Jump to get on top.

If there is anything important to note about a skip it will be written here:

2-4 (3): After this skip you will have to kill yourself at some point before the final part of the level, otherwise the level won't finish. You might be able to kys when fighting the enemies at the end (I didn't try that yet).

3-2: Since you have to downsize during the jump it can be quite tricky.

4-3 (1): As far as I'm aware you can't just Super Jump over those fences.

5-1 (1-3): It is possible to chain all 3 of them together.

5-2 (1): The camera doesn't always follow you so it can be impossible to do that skip.

5-2 (2): Rng in my opinion.

5-3: Keep jumping on that first ledge or you will fall off

5-4 (2-3): I think you have to do those skips in that order, but not sure.

6-2 (1): Not sure if there is a precise way of doing that skip, but i don't get it every time.

6-2 (2): You will need 1 extra relic container (there is one if you take the intended path). Also to make the following fight easier you want to kys on the enemies to reset their position, otherwise they might not be reachable for you.

6-3: If you fall into the arena without triggering the cutscene you will softlock the game.

7-4 (1): There is a gap you can fall down into so be careful.

7-4 (3): If you go a bit more to the right first it will change the camera and make the skip safer.

8-1 (4): It is faster to just get over the gap by double jumping -> gliding -> dash.

10-1: Possible to do on all of those robots in 10-1.