So recently (or maybe not recently, I just started playing again) Riot implemented a "Hextech crafting system". I'm still really confused how it works, but I managed to obtain another box besides the one that they gave me as intro-freebee. Now I think I need a key, but i don't know how to earn one. The article i posted in that link above says:
Earn keys as rewards for winning any matchmade games or by purchasing them at the store for 125 RP. Keys unlock chests through Hextech Crafting.
But I don't know what a "matchmade" game is officially. This Q&A says:
anything that uses the matchmaking system, so custom games are out, and that's it
but that doesn't help because I still don't know what the matchmaking system is. Aren't all games made by matching? if so, why didn't i receive keys for winning a normal-draft game? And I have RP but whats the point of spending it on this if i can just win it somehow?