Hello, there are plenty of resources on YouTube for how to glitch in PB2.

Though I would like to show some glitches that aren't as well known and give some tips on how to achieve them.

I will say that for gun-related wall clips, the timing that you shoot and the explosion appears matters, as well as the time you press X and jump. You should jump, shoot, and then once the explosion appears you can either choose to press X or time your X as you go against the wall.