What are the biggest things you had to learn before you became a winning player (or to get you on track to becoming a winning player.)?

For me, these 5 were huge.

1. The odds of making a flush aren't good enough to play any cards that are suited.

2. Sometimes you have to lay down a monster because sometimes you are beat.

3. Don't play games that you bankroll can't support.

4. Its not my job to be the 'hero' and call everyone bluff.

5. PATIENTS! How could I forget that? I had to learn to wait for good cards and pick my spots.

I've had alot more success after learning these things.