Well, what do you want to "hack"?
You already have the skill for looking up information and the basic knowledge of how all things computer work. Now you need a subject.
For example, you can start writing malware, or you could look for vulnerabilities in projects likely to have them (like systemd), you can reverse-engineer malware, or you can learn to break into networks or UNIX systems (or .NET servers), you can also reverse-engineer proprietary software and develop cracks for it. You can crack webapps, or learn how to collect all sorts of data on an organization or individual. You can try and hax mobile devices, or you can harden your OS and try to reduce as much as possible your footprint on the internet (through tor and other policies).
Pick a topic, and then just look for the likely source of information on the subject.