Much and many both mean “a lot of,” but we use them with different kinds of words.
Use many with things you can count one by one (countable words).
Use much with things you cannot count one by one (uncountable words).
If you can add -s or say “one, two, three” before the word, it’s countable. If not, it’s usually uncountable.
We use much and many mostly in questions and negative sentences. In positive sentences, people usually say a lot of.
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