git: Updates were rejected because the tip of your current branch is behind

1. Use the forced push method, which will cause the remote modification to be lost, which is generally not advisable, especially when multi-person collaborative development.

 git push -u origin master -f

2. Before pushing, modify the remote repository and pull it down

git pull origin master

git push -u origin master

3. If you do not want to merge remote and local modifications, you can create a new branch first:

git branch [name]

then push

git push -u origin [name]