I would recommend reading Tudor Bompa's Periodization and Methodoligies, and Westside Barbell's Conjigate System. Louie Simmons is a strength
Genius who is recognized as the foremost strength expert in the world and is owner of "The Strongest Gym In The World". And Tudor Bompa is
The godfather of Periodization (exercise planning). Periodization will lay out a very very indepth guide of how to reach your athletic best. This is science. Research backed by hundreds of scientists and executed by thousands of athletes. If you're serious about getting stronger or getting more muscular you will find no better.