Alright, the 3 main ways off glitching are these: Box glitch, wall glitch, and the fly glitch (dont bother the flying one, after a while you get client and its complicated

)
Box Glitch: Go to the corner of a box or some thing else with a corner (make sure u wont die in it). hold shift and rapidly keep pressing w and s, or a and d. When you body seems to drop a bit in a bit, move forward and duck (ctrl) to get inside. Then, depending on where you glitched, you will need to survive.
Wall Glitch:
Requirements: You will need 1 other person!
Go up to a wall (you will get on the other side of it, make sure it doesnt kill u in there

) Rapidly keep pressing A and D.
Second person: Keep pushing the other person into the wall by going behind them and walling forward into them.
Fly Glitch!!! :
Needs a second personLock onto each other (both crouch a good distance away, slowly walk to each other, but dont completely touch each other!)
You both need to jump at the exact same time (use a gun and fire as a signal to jump). As you keep jumping at the same time, you go higher and higher.
Warning! If you go high enough, u get client, stay in the air long enough u get client The point of this glitch is to get up to somewhere high.