ctrl == Command
ctrl + shift + F = Search/ Find
ctrl + shift + A = Find Action like refactor, code format and etc..
alt + Enter = Fix the bug or give suggestion to fix it
shift + ctrl + Enter = complete the block for a method, If, or , etc…
shift + shift = File search
ctrl + f12 = Search Method
ctrl + alt + O = Optimize Imports
alt + f7 = find usage
ctrl + alt + Left Arrow key = Navigate back
ctrl + shift + Backspace = Navigate back to last edit
alt + ctrl + B = Go to method Implementation (interface – implemented classes)
ctrl + ctrl = run anything