A lot of beginner's understand that bluffing is a part of poker, but not exactly how. There's is NO rule that one must bluff a certain amount or at all during a poker game, but many players don't feel like they've won unless they've tried a poker bluff. Bluffs only work in certain situations & against certain people, and if you know a player always calls to the showdown, it is literally impossible to bluff that player. It's better never to bluff than to bluff "just to bluff."