This video shows how to use the SSH Access interface to manage SSH keys which allows you to connect to your web server via the command line.
Documentation:
SSH Access - https://documentation.cpanel.net/display/74Docs/SSH+Access
PuTTY - https://www.chiark.greenend.org.uk/~sgtatham/putty/
Terminal Interface - https://documentation.cpanel.net/display/74Docs/Terminal+in+cPanel