If you are playing Blackjack Switch, you should use the Blackjack Switch Strategy Chart.
Stick to the Plan
Playing according to the strategy chart will get you a long way but learning it by heart is one thing, the real problem is sticking to it.
You might be tempted to double down on a soft 17 against a dealer's 2, but as you can see from our chart below, moves like that are not strategically correct, and will cost you a lot of money in the long run.
Don't play hunches, it will save you money.