Well, This probably should've been my first post saying how league of legends is quite fun and everything, but I forgot that so i'll just do it now.
First off, League of Legends is completely free to play. The way they make money is if you want to buy cool different skins of any of the champions. But other than that, the cost to play is 0. You earn champions through in game currency called Influence Points (IP), so once you save up enough you can buy the champion that you wish to play. They have a bunch of free champions every week that rotates, so you will be able to try every champion sooner or later without buying anything with the in game currency. Although I do suggest searching up a champion that looks fun to play and saving up for it.
So the game is basically a battlefield, where the goal is to destroy the other teams base, ripping through 3 towers on the way in each lane. There are three lanes and mid is usually solo. During the middle/end it requires alot of teamwork and coordination (or at least more than the other team).
It's tough at the beginning to learn, but once you get the hang of it you'll be hooked.
I can try to write a League of Legends guide later on.
If you're interested sign up through my referral link, download and enjoy