(You can learn about the difference between much, many and a lot of here.)
Practice 1: how much or how many?
Choose the best word to complete these sentence - how much for uncountable nouns, and how many for plural countable nouns (be careful with irregular plurals e.g. person/people).
Practice 2: much, many or a lot of?
Now try this exercise: choose the best quantifier - much, many or a lot of.