What are all these leagues people join?

Can someone explain the league system here. I keep seeing all the posts about leagues and it catches my attention. Any information would be welcomed along with experience shared within your league. Thanks in advance!:icon_bigs:icon_bigs:icon_bigs:icon_bigs

Hi my first league experience this season, I am very happy because it is a great experience on my way to play, it will definitely be fun to join them!

hello

I hope I can participate in that league !! It would be a great experience for me and to improve my game !! I have many things to improve ... but I am on the right track, greetings ..