1.问题
当在本地main分支上向远程main仓库push时发生如下问题
To github.com:ReturnTmp/study.git
! [rejected] main -> main (fetch first)
error: failed to push some refs to 'github.com:ReturnTmp/study.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.
解决方案：
git push origin main但是之后又报下面的错：
To github.com:ReturnTmp/study.git
! [rejected] main -> main (non-fast-forward)
error: failed to push some refs to 'github.com:ReturnTmp/study.git'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
解决方案：
1.先合并之前的历史，再进行提交——提倡使用
（1）先把git的东西fetch到你本地然后merge后再push
$ git fetch origin master
$ git merge origin FETCH_HEAD
先抓取远程仓库的更新到本地，然后与你的本地仓库合并，（如果有冲突就要解决冲突后再合并，冲突问题比较复杂，这里就不详细说了），这样就可以使远程仓库和你本地仓库一致了，然后就可以提交修改了。
（2）这2句命令等价于
$ git pull origin master
但是使用git fetch + git merge 更加安全。
（3）git pull --rebase origin master
重定基，可以是历史更加统一，即使提交历史趋向于一条直线。
补充：他们之间的关系
git pull = git fetch + git merge FETCH_HEAD
git pull --rebase = git fetch + git rebase FETCH_HEAD
2.丢弃之前的历史，强推-不推荐
git push -f origin main参考博客：Git错误non-fast-forward的解决方法_秦时明月之君临天下的博客-CSDN博客_git non-fast-forward文章来源：https://uudwc.com/A/8q8n
Git错误non-fast-forward的解决方法_秦时明月之君临天下的博客-CSDN博客_git non-fast-forward文章来源地址https://uudwc.com/A/8q8n
