How to access your account using SSH keys https://www.a2hosting.com/kb/getting-started-guide/accessing-your-account/using-ssh-keys#Mac-OS-X-and-Linux-operating-systems
How To Configure SSH Key-Based Authentication on a Linux Server | DigitalOcean https://www.digitalocean.com/community/tutorials/how-to-configure-ssh-key-based-authentication-on-a-linux-server