There are so many important things to keep in mind - everything from table image to betting strategies; luckily cardschat can help with those specifics (our forums are filled with them!).
However, I advise a few key thoughts BEFORE you even sit down at the table. Without these, everything else might be a losing battle.
I recommend taking seriously:
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bankroll management (not enough to just have money to play with - you should also understand variance and implement strategies like stop-loss if you need to do so)
-table selection (you could do everything "right" but still be destined to fail if you sit down with players all better at poker than you. You must determine for yourself what your poker goals are...making money and seeking easy tables, improving your game and seeking those tough tables [knowing you will likely lose], or just having fun [which makes homegames with friends ideal])
-Mindset: poker is not a "get-rich-quick-scheme" like some think it is. It is a game of long-term and even the "big win" stories like Chris Moneymaker in 2003 wasn't complete luck; he was a successful (and winning for sure) poker player even before his iconic
wsop Main Event win. Like anything else in life, improving a ton at poker will take a lot of time, study and investment. Without these, you are limiting how much you could improve (which might not be a bad thing if you don't want to improve much and just stay with friends and small stakes).
In summary, everyone is different and has different poker goals. However, these three things I recommend every poker player to consider at some point