Trying to push changes to GitHub, but the remote repository already contains work that you don't have locally (possibly a modification committed by someone else)

        This is usually due to someone else or another repository pushing to the same branch, causing a conflict between your local repo and the remote repo.

Error message:

To github.com:8upersaiyan/CKmuduo.git ! [rejected] main -> main (fetch first) error: failed to push some refs to 'github.com:8upersaiyan/CKmuduo.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.

Solution:

git config --global pull.rebase true # Set default to rebase strategy

git pull origin main #Sync from remote to local

After solving the problem of remote synchronization to local, solve the synchronization from local to network:

use:

git add .
git commit -m "resolve conflicts and update"
git push origin main

Push local changes to the network.