If you have come this far, we believe you are ready for the next step in your journey.
One option is to jump into the Intro to Capture the Flags course, where you will learn about data manipulation, cryptography, file formats, and some basic forensics.
If you want to focus on networking you can skip the Introduction to CTF course and head straight for Learning Networking with CTFs. That course is in progress, but should be pretty decent.
Another option is to jump into Learn Web Exploitation with CTFs which is a bit light on details right now but still will get you pointed in the right direction for CTFs or bug bounty.
There will be a course to learn Operating Systems and Host Forensics with CTFs eventually, but that course is still a long ways off and I don't want you looking at it yet.
Don't stop your journey here, keep on moving!