Rules, RTP and bet limits
Every game has an information or paytable screen, usually behind an i or menu icon inside the game. It tells you how the game pays, the minimum and maximum bet, and how any features work.
For slots and many digital games it also shows the RTP, or return to player. This is the share of all money staked that the game is designed to pay back over a very large number of rounds. An RTP of 96% doesn't mean you'll get 96 back from 100. Over a short session, results swing far above and below that figure. Treat RTP as a long-run property of the game, not a forecast.
Each game's paytable is the authority, so if anything here differs from it, the paytable wins.