I believe free spins are just like regular spins, you just get them for free. When I play slots, I usually go for the bonus buy, which gives some free spins, and honestly, it’s no different from betting a fixed amount and hitting auto-spin. If you’re lucky, you win, simple as that.

Games like this aren’t something to overcomplicate as it’s pure luck. Your only real chance to win is if luck’s on your side, so there’s no need to overthink slot probabilities or whatever.