General Glitches:

Levitate:
To do this just jump and Meele at the highest point of your jump. This is sometimes very hard and tidious but it is so cool when you do it.

Shoot your weapon without reloading:
Dont be host or it will not work. Get a gun. The best gun to do this with is the carbine. Shoot once and throw a grenade. Hold 'X' for half a second after you throw the grenade. Then keep pressing fire. Right before your clip runs out of ammo it will get filled back up to max. It does this until your gun is out of ammo. (This glitch only works with guns that can be reloaded with clips such as SMG, Carbine, Battle Rifle. Only exception to the glitch is the rocket launcher.)

Flying:
To do this get 2 people. One person in the wraith and one person facing the wraith on the wall. Make sure your back is right on the wall. Get the person in the wraith to ram in to you full speed and you will go flying in the air. This glitch only works with walls that are totally vertical or are slightly curved.

Flying Ghost:
To do this do the same as above except switch the guy on the wall to a guy in the ghost on the wall.

Cancel Jump:
The best way to do this is to switch your button layout to 'Boxer.' Let me explain why. To do this you must hit 'X' and 'B' not 'R' and 'X'. Have a player (Enemy) jump on your head and rapidly press 'jump' you keep tapping 'B' and 'X' rapidly. They will keep jumping off of you and you will sword cancel to them and then they will jump off of you again and so on and so fourth. You will go higher and higher and higher until you reach your destination. Now switching it to 'Boxer' lets you press 'L' and 'X' in stead of 'B' and 'X'.

Hog or Spectre Launching:
To do this get on one side of a level (multiplayer) and park the warthog/spectre there. Have another player (enemy) come to it as well. You get inside the passenger seat and have the enemy come close. Take out a Beam sword and put the crosshairs on him until it turns red. Then Tap 'R' and you will hear a slash sound but not see anything happen. Stay in the passenger seat and have the enemy go as far away from you as possible. (the farther he goes the higher you launch. When he is ready, aim in the direction you want to launch and get out. You will get launched in the direction you aimed.

Rocket Sword Canceling:
Get the rocket launcher and get as far away as possible (Do Not Zoom In) Now Keep Pressing 'Y' and 'R' (Make sure to waste all of your rockets before trying.) If you successfully accomplish this you will get launched to them from all the way where you were to all the way where he is.