What is wrong with github.com?
$ git commit -m "add all files together"
On branch master
nothing added to commit but untracked files present
$ git init
Initialized empty Git repository in D:/Users/210071113/Desktop/Zhen/Codeacademy/ Command_Line/excursion/.git/
$ git remote add origin https://github.com/ceceliazhen/excursion.git
fatal: remote origin already exists.
$ git push -u origin master
fatal: unable to access 'https://github.com/ceceliazhen/excursion/': Couldn't re solve host 'github.com'