Play a lot, analyze your games, and primarily study tactics. Your knowledge of openings, endgame, middlegame, etc. will come from analyzing your games and going over grandmaster games. Only study one of those specific topics if it is clear you are specifically losing because of that topic.
Source: https://www.gautamnarula.com/how-to-get-good-at-chess-fast/
As a coach, I can help you with any part of that process, as well as teach you EXACTLY how to think at every stage of the game. Good luck! 
I was wondering if anyone has practice routine for beginners? Or like if you're a teacher and u tell ur student to do this when u get home or practice this for a week and after that this typa thing.