How many kinds of pizza are there?

There are basically three kinds, one is American pizza, thick bottom, fermentation is hot fermenter fermentation, and pizza is also pressed by machine. There is also Italian pizza with a thin bottom, which is fermented in the refrigerator for 24 hours. The pizza is taken by hand. There is also the kind of direct dipping sauce baked by Taobao, which is the least difficult and the least delicious.