1. Create SSH key using ssh-keygen:
   • Specify key type using -t; the following are recommended for safety:
     • rsa with RSA number at least 2048
     • ed25519
   • Add comment using -C
   • e.g. ssh-keygen -t ed25519 -C "personal macbook"
   • Follow instructions to generate public & private keys
2. Add public key to Github user setting (under Settings -> SSH and GPG keys)
   • The whole public key line (including comment) should be pasted into Github
3. If the generated key pair does NOT have default name (id_XXX, id_XXX.pub where XXX is the key type), create a file ~/.ssh/config and write the following into it:

   Host github.com
       IdentityFile ~/.ssh/XXX
       User git
   

   where XXX is the non-default name of the key pair

4. Check SSH connection via the following command: ssh -T git@github.com. Upon success, it should print a statement like the following:

   Hi <USERNAME>! You've successfully authenticated, but GitHub does not provide shell access.
   

5. Unlike Gitlab, Github requires an extra step as noted in the statement above. Specifically, the remote repo URL needs to be updated as follows:

   git remote set-url <REMOTE_NICKNAME> git@github.com:<USERNAME>/<REMOTE_NAME>.git
   

   e.g. for remote repo my_test_repo owned by my_account:

   git remote set-url origin git@github.com:my_account/my_test_repo.git
   

6. Do git push as usual

Reference:

• https://gist.github.com/developius/c81f021eb5c5916013dc
• https://gist.github.com/xirixiz/b6b0c6f4917ce17a90e00f9b60566278
• https://stackoverflow.com/questions/14762034/push-to-github-without-a-password-using-ssh-key
• https://stackoverflow.com/questions/41412964/using-a-non-default-key-name-other-than-id-rsa