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The official docs cover every facet of the IPFS system. Everything from links to different communities and code repositories, to listing commands and configuration examples.
Pro Officially supported
The INSP docs are, of course, official documentation. This meaning that you're getting the info on the system directly from the devs, so you can be sure you're getting good info.
Con Can be daunting
Being official docs, they don't tend to hold your hand. It'll drop you right into the technicalities of the system. If you're already familiar with IPFS then this shouldn't be a problem, but if you're an absolute beginner it can be rough to start.