How to alias user@hostname:port for SSH. As a .conf file inside /etc/ssh_config.d directory

ssh.conf

# NOTE: You may simply put this config file inside /etc/ssh_config.d directory.
# Ref : https://www.howtogeek.com/75007/stupid-geek-tricks-use-your-ssh-config-file-to-create-aliases-for-hosts/
# To create ssh-keys easily use `ssh-keygen` @client followed by `ssh-copy-id server`
Host <alias>
  User <uid>
  HostName <ip or hostname>
  Port <port>
  IdentityFile <~/.ssh/your_saved_key> # for passwordless login
  ServerAliveInterval 120
  ServerAliveCountMax 30
# The above keepalive will refresh every 2 minutes for a maximum of 30 consecutive times.
# That means, it will stop refreshing after an hour
# Change values to your suiting

Host <next_alias>
  ...
  ...