When I was seven years old, I bought a book at the book fair at my school called "How to Play Winning Chess" by Fred Reinfeld. I read it cover to cover, many times. It took you from the basics to complex strategy, openings, middle game, and end game, and it wasn't even a very big book. Every chance I had, I would try out a strategy or "trick" I learned, and eventually I was the champion of my 4th, 5th, and 6th grade classes, two out of three years in my junior high, and every year in high school, thanks to that book.
Find a book by Fred Reinfeld and study it. Then slay all opponents.