Let me try to explain it. There are two teams. 5 players on a team. Each player gets to pick a 'legend' with a tactical ability and an ultimate. There is one nearly symmetric map. Your team has a base (Nexus) at one side and the enemy team has their Nexus at the other side. The map has 3 main avenues called "lanes". Minions (NPCs with low damage and low health) spawn at each nexus and follow the lanes to the enemy base. You get coins for killing enemy minions and enemy players. The coins are spent to make your 'legend' stronger by buying shit at the store (at your home base). The game is over when one a Nexus / base is destroyed. Its a fun game, but can get really repetitive. It takes awhile to get good at and will be a big time suck. There's a bunch of shit to learn and you need to keep up to date with the new 'meta' all the time. The leagues are ranked and chances are you'll never even get to Gold rank after playing for several months. Most people who play it end up developing ass cancer.