1、$ git push -u origin master
The authenticity of host 'github.com (13.229.188.59)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)? yes
输入yes回车就可
2、对那个文件夹的文件修改可以直接进入父目录下修改提交不用到根目下提交