why it puts me bot or supp while i select primary top sec jg ????

Autofill, it'll only happen around once every 10/12 games but it'll happen to everyone eventually

1. Learn Bot and Support. No harm can come from know how to play every role. It at least guarantees that you won't immediately lose out of ignorance.

2. Top and Jungle tend to fill faster, as they're the second most popular roles after Mid. This is even moreso since Kayle's VGU dropped, where she is played primarily top, and people think they can make her function in mid and jungle.