How can an attacker use ssh by connecting to it?

Question

SSH

If somehow an attacker has data for connecting to ssh, then what can he do there?
Can you recommend any literature on such post-exploitation for clarity?

Answer 1

All. Including, take advantage of holes and elevate your privileges to superuser.

Answer 2

Specify what is the data for connecting to ssh?
Exploitation is actually the process of obtaining data or access, and if you already have access, then an attacker can do anything that you can do on your computer to which you have access.

Answer 3

Maybe everything is enough rights, or a little more;)