SSH connection to Github

from my new machine, wanted to checkout my existing github repo and start making commits.

how do I do connect to it via SSH?
for ssh we would need a private and public key pair,
private key we keep, and public key we let github know.

lets do this

setting this up on ubuntu / linux

• assuming no existing key is present // generate ssh keypair

$ ssh-keygen -t ed25519 -C "[e-mail] or username"

• add private key to ssh-agent // why??

$ ssh-add ~/.ssh/id_ed25519

• copy public key and add to github account (settings>access>ssh keys)

public key details is here
$ cat ~/.ssh/id_ed25519.pub
  # Then select and copy the contents of the id_ed25519.pub file
  # displayed in the terminal to your clipboard

• test ssh connection from terminal

$ ssh -T [e-mail]

Ref : https://docs.github.com/en/authentication/connecting-to-github-with-ssh/about-ssh