This is very useful if you connect to tons of servers via ssh and you need to keep record of them as profiles.

• Edit/Create a file .ssh/config
• Add entries in this manner:

Host blabla
User blablabla # or domain\blablabla if it's a domain user
HostName x.x.x.x

Host blabla2
User blablabla2
HostName x2.x2.x2.x2

• Then all you need to do to connect to any of these specific connections using these specific users is to:

ssh blabla #To connect to server blabla with user blablabla

or

ssh blabla2 #To connect to server blabla2 with user blablabla2

For more info like advanced customization and features like using ssh keys, you can get help from the manual:

man ssh_config

Source:

https://nerderati.com/2011/03/17/simplify-your-life-with-an-ssh-config-file/