Hi there!
Welcome to the community! For CS
Crash, I recommend setting a safe cash-out point, like 1.5x to 2x, to minimize losses. In Roulette, the Martingale strategy can be useful but requires careful bankroll management.
As for platforms, I highly recommend KNIFEX https://knifex.com/ . It's great for commission-free skin betting and offers a fair and enjoyable experience.
Good luck!