In depth:
Ideally you want to be as close to a wall as possible when walljumping off of it (duh), but you also want to face your landing zone (i.e don't stare into the wall and hold w). To accomplish this, we'll break walljumping down into 2 parts: shooting and not shooting. For simplicity I'll assume you're walljumping on a wall on your right.
When not shooting, hold d and face forward so that your line of sight is parallel to the wall. Pretty simple.
When shooting, let go of d, hold a, and flick toward the wall all at the same time. When you've reached the angle at which you want to shoot the wall (which varies), shoot, and then immediately flick forward, let go of a, and hold d again.
The intricacies of angles and buttonpress timings are for you to figure out through practice.
glhf
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