For bubbly, airy loaves of bread and perfect chewy crusts, you need to build up gluten. Gluten is a strong network of cross-linked proteins that traps gas bubbles and stretches as the dough bakes. Gluten is developed by kneading, but creating enough gluten in a wet mixture like pizza dough can take up to 20 minutes if you're kneading by hand.
You could use a stand mixer (for detailed information on how to knead dough in a stand mixer, see this article) but by far the fastest, easiest way to knead almost any dough is in the food processor. The rapid action of a food processor's blade can turn dough elastic in just minutes with almost no effort. The food processor also helps ensure that the dry and wet ingredients are evenly incorporated and helps avoid unmixed pockets of flour for the most effortless doughs you'll ever make.