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[MindoverMaster]

There are tactic videos all over the net. There's several sites explaining this. All you gotta do is read or watch, and test it yourself against an AI. Best way to learn. Against a friend is even better.

 

[Burn]

It's best practice against other people... Practicing against AI is kind of useless once you're past like Gold league imo

 

[Hefemeister]

AI is only good for working on new build timings or if you just want to have a little fun.