If you're interested in learning about equipment, take a look at the online tack sellers. Browse their categories, look at stuff - sometimes it has pictures and descriptions. If you find stuff you'd like to know more about, open another tab in your internet browser and google the name of the item.
Watch videos of training exercises. Go on YouTube and look up the names of well known trainers (Like Clinton Anderson, the Parellis, Stacey Westall, etc) and look at how they ride and what's in their videos.
* I'm often reading and posting from mobile and Siri loves to make a mockery of the English language.