There are two quantifiers which we use to ask for quantity. Such quantifiers are "How many" and "How much".
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How much
We use How much when we talk about uncountable nouns.For example:How much money do you have?
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How many
We use how many when we talk about countable nouns.For example:How many cars are there?Note: in questions we need to use expressions which are "Are there" and "Is there"
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Difference
How many + countable nounHow much + uncountable noun.