The rhythm of a crash round
Crash runs on a loop, and the first thing to learn is the loop rather than the buttons. There is a short window between rounds where betting is open. You place a stake in virtual coins during that window. The window closes, the curve begins to climb from 1.00×, and a cash-out button lights up. From that moment there is exactly one thing you can do: press it. At some unannounced point the curve stops and the round is dead. If you pressed in time, you keep the multiplier that was showing. If you did not, the stake is gone.
Everything about playing the crash casino game well comes from respecting that structure. The decision is not made while the curve is climbing — by then you are reacting, and reacting is where discipline goes to die. The decision is made in the quiet window before the round, when you choose your stake and your target. The climb is just the part where you find out.