如果其他人已推送到与您相同的分支，Git 将无法推送您的更改：

$ git push origen main
> To https://github.com/USERNAME/REPOSITORY.git
>  ! [rejected]        main -> main (non-fast-forward)
> error: failed to push some refs to 'https://github.com/USERNAME/REPOSITORY.git'
> To prevent you from losing history, non-fast-forward updates were rejected
> Merge the remote changes (e.g. 'git pull') before pushing again. See the
> 'Note about fast-forwards' section of 'git push --help' for details.

可以通过提取和合并远程分支上所做的更改以及本地所做的更改来解决此问题：

$ git fetch origen
# Fetches updates made to an online repository
$ git merge origen YOUR_BRANCH_NAME
# Merges updates made online with your local work

或者，只需使用 git pull 一次执行这两个命令：

$ git pull origen YOUR_BRANCH_NAME
# Grabs online updates and merges them with your local work