Today, I modified a part of the project, and then used  git push origin master   The following errors are reported when pushing to the remote warehouse:

error: failed to push some refs to 'https://github.com/ZJyoung1997/JZShop.git'
hint: Updates were rejected because the remote contains work that you do
hint: not have locally. This is usually caused by another repository pushing
hint: to the same ref. You may want to first integrate the remote changes
hint: (e.g., 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

The reason is that the files in the remote warehouse are different from our local warehouse. For example, your remote warehouse has a file readme. MD, but the local warehouse does not. This may happen. My problem is that there is a readme. MD file in the remote warehouse, but there is no such file in the local warehouse. There is also because usually in the association, they use the association’s computer to develop, and when they return to their bedroom, they will use their own computer to develop, which may also be the reason for this problem. There is a solution to this situation, which is to directly kill the local warehouse and then re-clone it from the remote clone. However, this is obviously too troublesome. You can use the method of merging branches

Solution:

git pull --rebase origin master

The GIT pull command is used to obtain and integrate (consolidate) from another repository or local branch, retrieve the update of a branch of the remote host, and then merge with the specified branch of the local host.

fatal: 'master' does not appear to be a git repository
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Use git pull origin master --allow-unrelated-histories to solve this error.