How to Rebase to Another Branch in GitHUb

For examples,

1. There are recent commits to branch A, but the commits should have been in branch B. To fix this, in branch A, use TortoiseGit to rebase to branch B.
2. There is a new default branch called main but your PR was based on an older branch master. To fix this, in master, rebase to main.
3. When the maintainer requests to rebase to another branch