Setup Git and Github in Linux

Setup your local git config

git config --global user.name '<GITHUB_UNAME>'
git config --global user.email '<GITHUB_EMAIL>'

Setup ssh authentication

ssh-keygen -t ed25519 -C "<GITHUB_EMAIL>"
[ENTER]
[ENTER]

Copy the public SSH key

cat ~/.ssh/id_ed25519.pub

Paste it as a new SSH key in this page https://github.com/settings/keys