git add * (asterisk) vs git add . (period)

I'm new to git and I have a question about adding files in git. I have found multiple stackoverflow questions about the difference between git add . and git add -a, git add --all, git add -A, etc. But I've been unable to find a place that explains what git add * does. I've even looked at the git add man page, but it didn't help. I've been using it in place of git add . and my co-worker asked me why. I didn't have an answer. I've just always used git add *.

Are git add . and git add * the same? Does one add changed files from the current directory only, while the other adds files from the current directory and subdirectories (recursively)?

There's a great chart listed on one of the other stack questions that shows the difference between git add -A git add . and git add -u, but it doesn't have git add *.

Note: I understand what it means to use the asterisk as a wildcard (add all files with a given extension). For example, git add *.html would add all files that have a .html extension (but ignore .css, .js, etc).

Thanks for the help!

add * means add all files in the current directory, except for files whose name begin with a dot. This is your shell functionality and Git only ever receives a list of files.

add . has no special meaning in your shell, and thus Git adds the entire directory recursively, which is almost the same, but including files whose names begin with a dot.

* is not part of git - it's a wildcard interpreted by the shell. * expands to all the files in the current directory, and is only then passed to git, which adds them all. . is the current directory itself, and git adding it will add it and the all the files under it.