Beginner Dota 2 players (Dota 2)

Guys, I just started playing DotA 2 myself, but I didn’t play the first one, after going through the training missions I didn’t really understand what artifacts for which heroes are better to collect and how to do it at all, so I decided to open this topic, in which I propose to more experienced players to help beginners understand the game so that these same players do not have to say later that there are only crustaceans and crooked bottoms in DotA.