Login to your Digital Ocean droplet and generate an SSH key:

ssh-keygen -t ed25519 -C "sajadtorkamani1@gmail.com"

Start ssh-agent:

eval "$(ssh-agent -s)"

Add SSH key to the ssh-agent:

ssh-add ~/.ssh/id_ed25519

Copy your SSH public key to your clipboard:

cat ~/.ssh/id_ed25519.pub

Add the SSH public key to your account on GitHub. For more information, see “Adding a new SSH key to your GitHub account.”

Sources

• GitHub docs