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Development Tools Introduction to Git GitHub and Other Remote Repositories Pushing Commits to GitHub

When trying to push to my github, I receive "error: failed to push some refs to *mygithuburl*"

It popped up with a github dialog box that I typed my credentials into and I'm confident they were correct, because afterwards I checked them by logging back into the github site. Not sure what the issue is.

I know this isn't a good long term answer, but for the sake of following along with this video, I did a quick google search and added a -f to my command to force it and it worked. Would still like to know why I had to do this though if possible.