fatal: 'C: /Users/Lorenzo/our_clone' is not a valid remote name

I am 99% sure this message is going to be way too late, and that you probably already figured this all out by yourself; however, I am going to write it anyway, just in case the 1% prevails here :)

The first arg you want to pass to the "git remote add" command is not a path, but a name for the new remote, a name like could be Lorenzo or Nico, but for practical purposes, you may prefer to assign a meaningful, explanatory name; in this case of the video, it was "our_clone" I guess. So, again that's just the name, not a path. (That's the reason it's telling you, 'hey, wait that weird thing starting with C: etc. is not a valid remote name').

Then, the following arg is, indeed, like you perfectly did, the path of the branch we want to remote (I don't know if that's the perfect wording, but you get the idea).

Here that is explained in further detail. Indeed, that is a perfect place for solving doubts about this complex stuff, if you just remove the "Git-Branching-Remote-Branches" from that URL and refresh, you'll get the table of contents, talkign about everything you can imagine in Git. :)

I've used this book a lot for the "Extra Credit" bonus lessons. And I recommend you also should, it makes you feel so much more comfortable with it.

NOTE: Notice that if you type any command and then --help it will open some help in the console, and sometimes even a page similar to the book. Just to try this briefly, do this (will take you only a minute): First try:

git remote add --help

Check the output carefully. Make notes if you need to or want to.

Now check this:

git remote --help

That helps a lot when we are stuck. I've been there too, like about everyday I am, ha ha...