This document provides guidance on using "much" versus "many" based on whether the item is countable or uncountable. It explains that "many" should be used for countable nouns that can be counted, such as cookies, people, toucans. "Much" should be used for uncountable or mass nouns that cannot be counted, such as water, salt, homework, sugar, milk, work. Examples are provided to illustrate the distinction between countable and uncountable nouns and the correct usage of "many" or "much".