See all the options available to you, and also learn how to filter them.
To see all the configuration options available to you, you can use the reference manual on the website. Or, if you have an updated version of Git running locally, you can use the following command:
$ git help -c
If this command doesn't work for you, you likely have to upgrade Git. Here's a nice guide on how to do that on Mac.
Notice that there are a lot of options. If you'd like to filter the results, you can pipe to the
grep command and search for some segment. For example, if I wanted to see all config options with "init" somewhere in the name, I could run the following command:
$ git help -c | grep init
That should return a much shorter list for you.