Yes, there’s a lot of technology out there and it can be intimidating. Here’s the good news: It all works on a set of fundamental concepts that are pretty easy to understand. More good news: there probably aren’t that many different technologies that you really need to understand. These primers will introduce you to some fundamentals and then provide a topline summary of a few key technologies.
The block diagram has links to the rest of the site and may give you a few ideas on where you want to focus.