How to save multiple SSH configurations on your device

1. Open your terminal and type in code ~/.ssh/config, and hit enter
2. Add the following

Host <alias of the host> (This is what you will have to type in using ssh)  
  HostName <ip address> e.g. 192.0.2.3  
  User <username> e.g. root  
  IdentityFile <ssh file> e.g. ~/.ssh/id_ed25519.pub