Where can I get into theory?

Greetings.

For the last couple of months to a year I have been fascinated with CTFs and everything cybersec. Even though I am good for a selftaught teenager, I feel like I lack a lot when it comes to theory, understanding Networking, compiling all that stuff.

I have a basic understanding, for example I know what the OSI model is, TCP/IP, I know the differences between TCP and UDP, but where do I move from here? Are there more ressourses out there? I checked out the pinned post at the very top which seems epic, any thoughts?

Thank you beforehand!

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from hacking: security in practice https://ift.tt/YGqj9CU