Why will you want to play blackjack? This is because Blackjack is the first and most widely publicized game you beat the casino with, and for that matter you should learn how to play it in order to understand how to win it.
There are additional methods that have been used by players in the past and some are still applicable in today’s gaming environment while others have become sparse in their relevance. Shuffle tracking was popular in the mid-90s but has countered by casinos with increasingly complex shuffles. Key card sequencing was a method used to predict when an Ace would come out. This opportunity has also been reduced because of complexity of shuffles.
The last opportunity in blackjack is the rarest form and is hole carding. This is the technical art of determining of what the dealers down card is. I say this is a rare because it’s only found in approximately 1 in 80 dealers. And it is not something that card cannot be determined every hand.
Further complicating things is that you are not determining exactly what the card is. Often, you only get a glance at the pips of the cards. You then have to determine a strategy that is optimal by the narrowing of the card. Is the card a 10 value or not is a popular blackjack strategy? Is the card an 8 or a 9 are a few more examples? The strategy determination often requires computer simulations.