If you play blackjack in an online casino it's very important that you have a winning strategy. Blackjack is a favorite game of many gamblers because if you do stick by your basic strategy, your chances of winning are greater than in any other online casino games.
Blackjack basic strategy requires an understanding of the basic mathematics that govern the game. If you follow a good strategy, you are reducing the advantage the house has on you to the very minimum. They will still always have an edge, but it can be mathematically so small as to be almost meaningless, under 1%, with a good basic strategy it can be as low as half a percent.
The basic strategy you choose in playing blackjack will depend on the exact rules being used in the specific online casino links, there can be small variations with regard to what is allowed and what isn't, how many decks are used, when you can double down, etc. – and these have an effect on the basic strategy you should use.
A well tried and tested and highly recommended basic strategy is detailed in the following blackjack strategy chart (Source – wikipedia)
you can find more info about Blackjack at this BlackJack overview. BlackJack Rules , BlackJack stragety, BlackJack Glossary and even card counting for the more advanced blackjack players.
S means stand, H is hold, Dh is double or hit if not possible, Ds is double but stand if you can't double, SP is split and SU is surrender.
If you continually use this basic strategy you will be eliminating the advantage of the house, and maximizing your chance to win big!
But perseverance is important here, many times you 'gut feeling' will be to play your hand differently, and this is exactly where you are putting yourself in danger of loosing. This non-rational behavior is exactly what any online casino expects you to do when you gamble, so even if you can match their chances using a good blackjack basic strategy, they are counting on you straying away from it from time to time and this already tips the scale in their favor.