Reddit mentions of Sams Teach Yourself Networking in 24 Hours

It all ties together. If you want to work in IT, network and hardware certifications are quite valuable.

So let's start with networking. I recommend starting with a book like this one: http://www.amazon.com/Teach-Yourself-Networking-Hours-Edition/dp/0768685761

Once you identify more specific things within networking that you want to learn, you can then get more in depth by finding resources online, and in books.

Code is also a good book. If you want textbooks:

This is a good one for computer architecture. And there's a companion course/website at www.nand2tetris.org. https://www.amazon.com/Elements-Computing-Systems-Building-Principles/dp/0262640686/ref=ed_oe_p

I like this one as far as operating systems go: https://www.amazon.com/gp/aw/d/1118063333/ref=dp_ob_neva_mobile

For learning programming, I would check out courses at www.udemy.com. But be mindful of ratings & reviews because the quality of courses can vary pretty drastically. But I've had good experiences there. www.udacity.com also has great courses. They offer paid nanodegrees but you can take every individual course free of charge. www.teamtreehouse.com is another good website

If you're interested in networking, this is a good book for starters: https://www.amazon.com/gp/aw/d/0768685761/ref=dp_ob_neva_mobile

Any A+/Network+ certification books or courses would also be a great way to learn networking and computer hardware

Those are pretty big topics in tech & computer science. There's a ton of stuff to learn. I've been studying this stuff for probably 2-3 years and sometimes I feel like I've barely scratched the surface. Let me know if that helps & if there are other topics you'd want book recommendations on! :)