Learning how to make other bread products will teach you a lot about dough in general. How it behaves, the difference between wet and dry doughs and how they ferment, how to build dough strength through mixing, S&Fs,and by cold fermentation. Make sweet breads, bagels, rolls, buns, tortillas, croissants, baguettes, country loaf, donuts, pretzels, pastas, etc. You'll be surprised at how all of these processes share many similarities and how much your pizza will improve.