How do you jump without strafe jumping? Can you please tell me?

Thanks for the video, but the thing is the instructions are a bit difficult to follow since the button config and my play style does not allow me to hold all the keys while making the jump ( I use my ring finger for both A and Shift!)..... So does anyone have any other method?

I need help with a jump i have seen ppl online do in the crash map. The jump is near the heli towards A, where you see 2 wooden stacks, one on the floor and the other leaning to the wall. I have seen ppl jumping from there to the A dumpster, effectively making it a shortcut to avoid going through th...