One of the most important things to know, is knowing when to quit. If it's not your night it might be wise to just call it quits. Play within your bankroll at all times and play with money you are comfortable losing. Considering gambling money lost to make it an easier mental game. In case you win its all profit, and when you lose it's nothing less than the expected result. Keep your head in the game and base your decisions on math, not on superstitions or tips from people standing behind you.
 

When playing Blackjack without putting some time into learning the basics you are also making a huge mistake. Even if you're not likely to play this game day in, day out it's still a good move to read through some basic strategy. Don't believe that Blackjack is a game of luck; it's a game of probability. The fact that you are not winning might not have to do with lady luck, but with luck of skill. Remember that in the long run skill will prevail in this game.