When we’re talking strategy in Blackjack, you need to know about six basic components of the game. 
Speaking of money, the best and fastest way to make it when playing Blackjack is by successfully doubling down at every opportunity.
Doubling down can make you double your bet or end up costing you double if you do it in a bad spot. The first and most important rule of doubling down is, always double down any hand totalling 11.
When your hand is 10 and the dealer is showing a 9 or lower, double it up.This hands give you the best shot at cashing in when you double down. Follow those rules and you’ll end up on the winning end of a double.
There are many kinds of strategies in Blackjack but this is one of the simplest and most secure, but to try you need very much courage.
