These are the general glitches used in runs:

-Gun spam-

Pick up any gun and aim it to the ground or anything that blocks the gun. Hold left click and spam right click right after. Keep holding left click or the gun spam will stop. Some Guns dont need to be held blocked by a wall and can be instantly spammed.

-Slide boost -

Simply spam "s" and avoid anything that could slow you down. It's considered a slide boost if you slide more then 1 time in a row. Keep that in mind if you run Glitchless% !

-Wall clip-

This happens when you get pushed in a wall by a entity that can move. Mostly happens when you slide and something falls on you from the top. Can also happen when you are in the falling motion and have your head towards the ground so that its inside it. After landing Karlson will be clipped in the ground.

-Wall jump-

If you have a wall to your right you hold "d" and after you cant go any further you press "spacebar" and "a" at the same time. This makes you wall jump.Now you just need to go back to the wall and repeat.