This is going to be a quick guide on a good portion of the strats.
LAG CLIP - Get super close to a wall, but don't touch it. Hold W and a fraction of a second later hold Minimize at the top of the tab. Drag your cursor back into the window, and release click. You should now be on the other side of the wall.
Roblox has a movement bug where you do /e dance2 , and when your character jumps right, pull out just about any item except the Ocarinas. Then, activate Shift Lock, and hold W and D for a speed boost.