You might be wondering: "How the hell do I know whom to hack?".
The answer is: the same way people will know how to hack you - through the logs.
As you know, everything you do on a server will be logged.
Therefore, whenever you connect to a remote IP, remember to quickly delete your data from the logs.
Use it to your benefit too: search the logs for unknown IPs. Hack the ones you find. Profit from them.