As a beginner or intermediate player it's probably best to only raise with premium hands in early position. The problem with this, however, is that it makes your hand range easy to identify and thus you become somewhat easy to play against.
If you already have a good understanding of how to play Holdem and are looking for a few advanced ideas to add to your game, read the following Advanced Poker Tips:
#1 – Open up the hands you raise with in early position. As a beginner or intermediate player it's probably best to only raise with premium hands in early position. The problem with this, however, is that it makes your hand range easy to identify and thus you become somewhat easy to play against. Adding in random hands like connected and suited cards to your opening range can help change that. This doesn't mean you should raise with these hands every time you are dealt them in early position, but you should do so enough that your opponents know you are capable of raising with more than just aces or kings.
#2 – Re-raise early position raises more. Here's the thing about re-raising an early position raise... most players know that the initial raiser “probably” has a very strong hand therefore a re-raise of this opening raise has to mean a very good to great hand. It creates doubt in players’ minds and they will often fold a hand that is much better than yours, even hands like A-K or pocket jacks, because of both your raise and the initial raiser. The initial raiser also has a dilemma because they understand that their raise represents strength and that your re-raise indicates that you aren't afraid of their strength. Unless they have a monster like aces or kings, they will often play right into your hands and either fold or call and check/fold post-flop when they miss.
#3 – Unless you are absolutely certain that the players in the blinds are rocks, raise less from the cutoff and button. This is going to go against the grain of conventional poker thought but modern tendencies make raising from late position such a well known move that many players have adjusted their game and are three betting light (raising with marginal hands) against these opening raises. It has made stealing from late position much more difficult. This doesn't mean you shouldn't ever steal, you just need to make adjustments against players who will three bet often (including coming over the top with a light four bet on occasion).
The Main Holdem Strategy Index: The Great Game of Holdem