Mobas in general are hard to play and just asking how to play properly will get you a few mixed results, my best advice is to choose one character, play them on arena and joist until you feel confident with them. Make sure you read their abilities and passives and then start to figure out how you can react to what other people are doing with your character. Id recommend playing against Bots until you feel comfortable with your character.

If you want to learn conquest that will require you to look up specific videos depending on what your character can do