I tried git push on master branch but it just shows that I have new pull request but when I click on new pull request it takes me to comparing changes but doesn\'t show any
GitHub is working on replacing the term "master" on its service with a neutral term like "main" to avoid any unnecessary references to slavery,
you can read here for more background the reason for the change https://www.zdnet.com/article/github-to-replace-master-with-alternative-term-to-avoid-slavery-references/
about renaming your branch from master to main: there are a lot of guidelines for example here https://jarv.is/notes/github-rename-master/
git branch -m master main
git push -u origin main
git remote set-head origin main