If you're good at poker, you know how to bluff. If you are not good at poker and you enjoy playing for money...you are an idiot.
With that said, bluffing is actually a brilliant calculation of the odds, the table, and the competition.
A great bluffer has no 'tells'. Bluffing is simply a necessary part of your poker arsenal. And there is no chance you can beat the pros by playing 'tight'.
This tutorial comes from myholdemtips.com, a simply excellent site.