这通常是由于其他人或其他仓库推送到了相同的分支上，导致您的本地仓库和远程仓库之间存在冲突。

错误信息：

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.

解决方法：

git config --global pull.rebase true  # 设置默认为变基策略

git pull origin main #从远程同步到本地

解决完远程同步到本地的问题，在解决从本地到网络的同步：

使用：

git add .
git commit -m "解决冲突并更新"
git push origin main

把本地的修改推送到网络上。