Are these sentences correct:
1) It is very much interesting.
2) There is very much of food.
3) There are very many peaople on the street.
Thanks in advance.
1. It is very interesting.
2. There is very much food.
3. There are very many people on the street.
As you can see, you got sentence 3 correct, but not 1 or 2.
In 1, "interesting" is an adjective not a noun, so you cannot attach "very much" or "very many" to it. It's simply "interesting" or "very interesting".
In 2, you added "of". You probably got that idea from "a lot of" which would have been more natural. "There is a lot of food". It is possible to say "There is very much food" but it's not very natural.