I'm not the best at understanding how to strafe the best in Portal when ABH-ing, I I always stutter, shoot off one direction, or hit walls. was wondering if there's any tips to improve mainly strafing? :)

Try only starting your strafe while you are in the air and stop strafing after you hit the ground. That's what I do but maybe I'm doing it wrong aswell. :P

You know what they say, practice makes perfect. If by strafing you mean like, using the strafe keys to turn, then I'd say just slow down a bit. Turning and controlling momentum is hard when you're going too fast.

I could probably give some more detail if I could see what you're talking about/what you're doing wrong. Or maybe spefic chambers.