There are mainly three different types of composting:
Aerobic- Air is used to help break down materials rapidly. The compost should be turned over every few days.
Anaerobic- This is the opposite of aerobic, this takes much less effort. Just place scraps into a compost pile and don’t mess with it for a year or more.
Vermicomposting- This process uses worms, oxygen, and moisture to decompose organic material with few odors. Red worms are a favorite for this form of composting.