Video explanation https://www.youtube.com/watch?v=y4TlV6EZ-JI&t=2s
Much:
We use much when talking about nouns we can’t count.
Much money, much fruit, much water
Many:
We use many when talking about nouns you can count
Many people, many hairs, many drinks
Few and a few:
The next subjects are few and a few. These are used when talking about a small quantity in combination with a countable noun. The difference between the two are that few emphasizes how small the quantity is and with a few it is still not much but more than few. You could say that few is a half empty glass and a few is half full.
Little and a little:
The explanation for these are almost the same as for few and a few. Little emphasizes on how small the quantity is, almost nothing. A little emphasizes on a small quantity as well however the meaning is more than little. These are used with uncountable nouns.