dot sign's meaning in git checkout command

Question

if I use git command like this:

git checkout -- .

I know its effect is to discard all unstaged files everywhere.

Can anyone tell m

Answer 1

The dot (.) refers to the current working directory.

You are asking git to checkout the current directory from the checked out branch. The double-dash is used to separate references, such as master or HEAD from file paths, such as myfile.cpp.