p::?

Answer 1

p for paragraph. but : this diffrent property. you can use :before-after , :hover , :focus : first:line, :first letter , :first-child ....

Answer 2

example
<p>Apple </p>
when CSS is applied
p::after{
content:'123';
}
output
Apple123

like this there many other selectors
::before
:hover
......etc
just Google it I hope you will get more and better results.

Answer 3

in paragraph . .

Answer 4

can u give some example?. .any output in paragraph.