install git at you laptop
https://git-scm.com/downloads
config git at you laptop
git config --global user.name "Your Name"
git config --global user.email "[email protected]"
git config --global core.autocrlf false
git config --global core.safecrlf true
add a project at github
New a project at github
git clone project at laptop
git clone github repo address
open project at atom
package - github - Toggle git tab
select a branch
edit the files
git commit
git push