Easy for Linux/MacOS, see here: https://git-scm.com/book/en/v2/Getting-Started-Installing-Git
On Windows, the best way is to use: https://git-for-windows.github.io
$ git config --global user.name "John Doe"
$ git config --global user.email "johndoe@example.com"
$ git config --global color.ui auto
Now you have a (remote copy) where you can push to.
$ git clone git@github.com:your-github-name/tutorial.git
$ touch your_name
$ git add your_name
$ git commit -m 'add myself'
$ git push origin master
https://github.com/your-github-name/tutorial
\o/