You should do as much research possible and look up if you fully recognize the concept of fixed odds gaming.
They can bet by numbers, like even or odd, by colors like black or red and more. With slots you have to press a start button and wait if a winning combination hits the pay hoses. https://kenhtingame.com/giai-tri/rikvip-huong-dan-choi-mini-poker-tro-choi-don-gian-vui-nhon/458393