First of all, check if you have had public key by:
If you have foo and foo.pub, it means that you aleardy have a private key and a public key. Repeat the following methods will overwritten the keys if they have the same name.
To generate ssh key, use the command below:
ssh-keygen -t rsa -C "firstname.lastname@example.org"
Feel free to enter ENTER during the generation.
To check your public key (Note, id_rsa is the default name):
Copy it and paste into GitHub's settings page in Account Settings->SSH Keys->Add SSH key.
Note: if you use this key to access to your remote server, then you can copy the content of your public key and paste it into the ~/.ssh/authorized_keys file.
To test it:
ssh -T email@example.com
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