I need CSS help 3

Question

set and give exemples de selectors:
•universal
•simple
•composite
•chained
•identifier
•class

HELP ME, PLISS!!

Answer 1

universal *{margin:0}
simple p{color:red}
id #
class.

Answer 2

do you want a more specificle?

Answer 3

I want a definition and example of using these selectors quoted in the question !!