Welcome, noob glitcher! Glitching is like painting with pixels, but without the talent.
First, learn about the basics: Glitching 101 Bits (the fundamentals)
Or, if you're feeling adventurous, jump straight to: Glitching 101 Bytes (where the magic happens)
We also have a special section on: Glitching 101 Bits Bits (just for fun)