Go to any AWS instance
# sudo su -
# pwd  ==> should be root

Generate the ssh key as mentioned below:
https://docs.github.com/en/github/authenticating-to-github/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent

# ssh-keygen
# cd /root/.ssh     ==> 2 files should be there id_rsa & id_rsa.pub
# eval "$(ssh-agent -s)"    ===> start the ssh-agent in the background
# ssh-add ~/.ssh/id_rsa    ====> Add your SSH private key to the ssh-agent
# cat id_rsa.pub    =====> Copy the ssh public key to github
# Go to github ==> Settings
# go to SSH section on left side 
# Click on Add new ssh key
# give a name as developer1
# paste the copies ssh public key from EC2-instance
# go back to ec2-instance
# cd
# git clone git@github.com:Sonal0409/myproject05Aug.git
# successfully able to clone , push to github without authentication.