Use "many" with countable nouns and "much" with uncountable nouns: "many emails", "much time". If you are not sure which one fits, "a lot of" works with both.
Wrong → right
Common mistake
Corrected
How much people came to the demo?
How many people came to the demo?
I don't have many time this week.
I don't have much time this week.
There were too much cars on the bridge.
There were too many cars on the bridge.
How many money do we have left?
How much money do we have left?
We didn't get much orders today.
We didn't get many orders today.
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