Lots of is more informal than a lot of. A lot of and lots of can both be used with plural countable nouns and with singular
Is a lot many correct?
A lot of/lots of are used with both plural count nouns and non-count nouns. They are usually used with affirmative sentences. We met a lot of people when we went out. ... Much is used with non-count nouns and many is used with plural count nouns.
When to use some any a lot of?
The Main Difference Between SOME and ANY
As a general rule, we use 'some' for affirmative sentences, and 'any' for questions or negative sentences. Usually, both 'some' and 'any' can only be used with countable plural nouns or uncountable nouns. For example, “I have some questions.”