I know nothing about networking or security. What has helped me was going to the library and checking out any books they have on networking and security. I don’t actually read the books through, I scan them for terms I’m not familiar with and just read about those. It has helped me a lot more than trying to find it online or ask specific questions on forums. There’s so many books and info, I mean people go to college for this stuff. Even the “for dummy” books are a useful resource.