[email protected]: Permission denied (publickey)

You’re accessing GitHub through SSH. First generate an SSH key pair; then add the public key to GitHub.

Generate key pair:

ssh-keygen -t rsa -b 4096 -C “[email protected]”

See more at https://help.github.com/en/articles/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent and https://help.github.com/en/articles/adding-a-new-ssh-key-to-your-github-account