There's not much to explain as far as the rules of slots. You basically put money into a slot machine, spin the reels, and hope that you hit a jackpot.

Depending on the slot machine you're playing, each game will likely have a bonus round feature as well as different payouts for hitting a variety of combinations on the reels. Each machine will also usually allow you play multiple numbers of paylines, if you bet more before spinning the reels. In order to win the largest jackpots on most machines you must be playing the maximum number of lines, which is something you should keep in mind.

Other than that, though, slots is pretty straightforward. Each machine will have its pay table posted prominently, which tells you exactly what each combination will pay, as well as what you need to do to trigger bonus rounds and win jackpots.