Aaron Marino of alpha m. discusses how to break down muscle tissue then rebuild muscle tissue bigger and stronger. Aaron goes over muscle building basics at a cellular level.
Working out tears down your muscle fibers. When you consume protein, your body breaks it down to amino acids and shuttles it to the muscles. The muscle fibers heal bigger and stronger. Repeating this cycle will give you that dream body as long as you also add in the other 75% which is what you eat.
You also need to make sure you give your body time to rest. If you don't give enough rest in between, you might not see the gains and you might get weaker.