src refspec study.md does not match any. error: failed to push some refs to 'git@git code example

Example 1: error: src refspec master does not match any error: failed to push some refs to android studio

git commit -m "initial commit"
git push origin master

Example 2: error: src refspec master does not match any.

git init
git add . //to add everything
git commit -m ''
git remote -v
git push heroku master