Welcome to the community and hope to have you as a fellow Hubitat user real soon! A great resource is the Documentation link up on top of this page, there is a lot of info in there.
For natively compatible devices (found in the documentation), here is the direct link to it so that you don't buy stuff only to learn it's not compatible.
Then there are a ton of drivers in the community, so if you don't see a device in the official list, search here in case someone made a driver for it.
When you get your hub, I would also suggest you install the great community app that will help you to get new apps and drivers installed in a jiffy...
