Git/GitHub can't push to master

Question

I am new to Git/GitHub and ran into an issue. I created a test project and added it to the local repository. Now I am trying to add files/project to the remote repository.

Answer 1

I added my pubkey to github.com and this was successful:

ssh -T git@github.com

But I received the "You can't push" error after having wrongly done this:

git clone git://github.com/mygithubacct/dotfiles.git
git remote add origin git@github.com:mygithubacct/dotfiles.git
...edit/add/commit
git push origin master

Instead of doing what I should have done:

mkdir dotfiles
cd dotfiles
git init
git remote add origin git@github.com:mygithubacct/dotfiles.git
git pull origin master
...edit/add/commit
git push origin master