Walking On The Edge

 

Crouching is a useful way to expand your movement options. By crouching, you can actually walk a little bit off the edge of a block. This is ideal when you're building a bridge-like structure.

Be careful you don't let go of the crouch button. If you do, then your character will fall. So, if you plan to try this trick high in the air, then make sure you hold onto that crouch button.