I ran into an issue where I needed to push changes to a repository that was on a second GitHub account I created for a simple website project. I was receiving an error from the terminal in VS Code that I didn't have permission to do that. I had already
added the SSH key to my GitHub account, but was still giving me an error. I found
help in GitHub's docs by telling my computer's ssh-agent to add the newly created key, and was ultimately able to solve the problem and rejoice in my victory! :)