Late Position Hand Selection

In late position your hand range widens when you're the first into a pot.
Of course it is still not recommended to raise with junk hands. But you should increase your aggression in the late position.

When you're not holding premium cards, folding to a pre-flop re-raise is OK.

In general: When action folds to you on the button, it's acceptable to raise up to 80% of your starting hands.

In case you want to bluff you have to consider the following:
-Stack size of your opponents especially the blind positions
-Your style of playing and how your opponents notice it. If you raise very often it might not be a good idea to bluff.

Bluffing

Bluffing is a very important part of poker. If luck is not at your side it is the only way to win.

By your biding you pretend that you have good cards but infact you have nothing. If your bluff is successfull all your opponents will fold because they think they have no chance to win and you get to win the blinds.
Beware: you can only bluff if there are bluffable cards on the flop.
If the flop is i.e. 9, 10, K you could bluff a straight. If it is 2,6,10 you can go for a three of a kind bluff maximum. Always check if a extremly good hand is possible before you bluff.

It is also possible to bluff a bluff. If you have a extremly good hand (full house or straight flush for example) and you want to make the most out of it you can bluff a bluff. Your opponents should think, that the noticed your bluff and go with your extremly high raises. This is rather difficult to achieve but if you failed a bluff before it is possible, that the trap works.

Poker - Cheatsheets#2 Bluffing