Note: if you are upgrading to a major version of the OS, make sure you backup your important data before proceeding.
If you have a Windows workstation: install MobaXterm
If you have a Linux or MacOS workstation, make sure you can find the terminal.
For question #2, please include a few sentences describing how you found the vulnerability and how you fixed it.
For question #3, please explain what OS you are using and which application you will be using as an SSH client.