None of the tutorials will help!
They all do that thing where they just assume I know what to do..
Currently, my terminal window starts with..
#
I don't know your system environment, but it seems, that you have typed:
git commit
And your default editor has been launched. In the worst case scenario (for you) it could have been vim :)
If you don't know how to quit vim, use :q.
If you have further problems, you could use
git commit -m 'Type your commit message here'