@mangagon
Some things yeah.
If your opening hand is 9 ou 10 (or if you get 9/10 after one draw), you should try to double down (you pay twice your initial bet, and you can win even more points/dollars/etc).
When you double down, you can only draw one more card, so it's dangerous, but if you draw a 9 or 10, you got 19/20, so it's worth the risk.
The bank is forced to draw if they're under 16, that's why you should always try to get 17/21 just to be safe.