So, the core concept is simple.  I put an object on a server somewhere, and I want other people to know that it's legitimate.  Using this NIP, I create an event that identifies that object, tells others where to find it, and attests to it with my Nostr identity, all at once.

Beyond just Git, this NIP can form the basis of SharePoint or Google Drive services, software release verification, authentication of images, and many other use cases besides.  The only limit is imagination.