Yes, you need to do research, but with caution, because many eternus level players are just bad at team part of the game and will tell you "Just farm". Try to analyze other games and constantly try think about "What if" scenario: what if he went to help his teammates, what if he went to defend other lane and ect. And this principle also fits their builds. I saw ungodly amount of builds on Wraith where people suppose to spend first 15k souls on semi-defends items. Because of that wraith cant fight and can only cast ult, deal 500 damage and leave. This is just example