Just keep playing all different heroes. The most important thing when learning is to understand all heroes and what they do/what role they play. So you know what you are up against. Next would be undertanding your role in the game, what is expected of you from the team and what you need to focus on. Then I would say understanding what all the items do, because most of the time its upto your discretion what you will purchase.
Unfortunately Dota is full of assholes. You can mute players from the little drop down menu on the top left of your screen that shows the players.
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