For every hand in blackjack, there is one and only one correct play.  Basic strategy is the set of optimal playing decisions that will maximize the expected result of your playing strategy.  Basic strategy is the foundation of professional blackjack and is the first step that must be mastered.

Blackjack Strategy - How to Play Your Blackjack HandBlackjack Strategy - How to Play Your Blackjack Hand
Basic Strategy Chart – Dealer Stands Soft 17Basic Strategy Chart – Dealer Hits Soft 17