What’s the difference between 0/0 and 1/0?

The first one is about the arithmetic, and is fairly simple, and is not very different from the other answers here: neither !! , as an individual number, never makes sense, for one reason or the other, either because there is no such !! But to really understand the difference you probably need to use the calculus approach, which may be more delicate than what you are used to.

Source: blog.plover.com