Before we dive into the commands, I want to show you a quick guide that exists online in case you get stuck or you have any questions. You can Google GitHub SSH keys, and this is going to link you to an article called generating an SSH key: https://help.github.com/articles/connecting-to-github-with-ssh/. Once you're here, you'll be able to click on the SSH breadcrumb, and this is going to bring you back to all of their articles on SSH keys:
Out of these articles, the nested four are the ones we'll be focusing on checking if we have a key, generating a new key, adding the key to GitHub, and finally testing that everything worked as expected. If you run into any problems along any of these steps, you can always click on the guide for that step and you can pick the operating system you're using so you can see the appropriate commands for that OS. Now that you know this exists, let's go ahead and do it together.