1.You need to type this command in the console.
bind mwheelup +jump (you'll bhop when you scroll up)
or
bind mwheeldown +jump (you'll bhop when you scroll down)

THE CHANCE OF HITTING A BHOP IS 50/50.

2.Strafing
In the air you need to hold ONLY "A" or "D" (Let go of all movement keys),
and time it with moving your mouse left or right. (this way you get speed)
3.Perfect Bhop!
Walk forward, jump, let go of W, hold A and look left (slowly at first till you get it), let go of A , hold D and look right.
THAT'S IT! I HOPE YOU BHOP WELL!