About branches→
Use a branch to isolate development work without affecting other branches in the repository. Each repository has one default branch, and can have multiple other branches. You can merge a branch into another branch using a pull request.
Creating and deleting branches within your repository→
You can create or delete branches directly on GitHub.
About pull requests→
Pull requests let you tell others about changes you've pushed to a branch in a repository on GitHub. Once a pull request is opened, you can discuss and review the potential changes with collaborators and add follow-up commits before your changes are merged into the base branch.
About comparing branches in pull requests→
Pull requests display diffs to compare the changes you made in your topic branch against the base branch that you want to merge your changes into.
Creating a pull request→
Create a pull request to propose and collaborate on changes to a repository. These changes are proposed in a branch, which ensures that the default branch only contains finished and approved work.
Creating a pull request from a fork→
You can create a pull request to propose changes you've made to a fork of an upstream repository.
Changing the stage of a pull request→
You can mark a draft pull request as ready for review or convert a pull request to a draft.
Requesting a pull request review→
After you create a pull request, you can ask a specific person to review the changes you've proposed. If you're an organization member, you can also request a specific team to review your changes.
Changing the base branch of a pull request→
After a pull request is opened, you can change the base branch to compare the changes in the pull request against a different branch.
Committing changes to a pull request branch created from a fork→
You can commit changes on a pull request branch that was created from a fork of your repository with permission from the pull request creator.