git init
git add .
git commit -m ‘first_commit’
 #链接是你自己的项目的https链接
git remote add origin https://github.com/zhazhapan/PracticalToolBox.git
git push origin master

• fatal: remote origin already exists
  
  
  

  执行： git remote rm origin
  然后再执行：git remote add origin https://github.com/zhazhapan/PracticalToolBox.git
   

  
  


• error:failed to push some refs to…….
  
  
  

  执行： git pull origin master
  然后再执行：git push origin master
   

  
  


• fatal: refusing to merge unrelated histories
  
  
  

  执行： git pull origin master –allow-unrelated-histories
  然后再执行：git push origin master