I think this book is its own "for dummies" version: it starts at the very basic ("what is a HTTP?") and then slowly walks its way down to "how does conflict prevention in WiFi work?")

Most of those chapters are probably not relevant to you. All the wireless stuff is nice if you want to dig into setting up your own radio network but you can stick to the internet stuff. Not even everything in there may be relevant to your interests, I've forgotten most of the network/routing graph discovery stuff myself because it's not really relevant unless you're planning on running a corporate network or an ISP. I recommend just giving it a good go, and skipping the parts you probably won't ever need. You can always read them later if a later chapter refers to them and you need to understand after all.

As for Linux stuff, last month's Humble Bundle had a bunch of Linux related books: https://web.archive.org/web/20220913000217/https://www.humbl...

You can probably find people talking about this bundle online and find out what books/alternatives they recommend. There were a few Reddit threads about this at the very least, maybe a HN thread or two as well.