1. Fork the main project https://github.com/OpenMRS-Australia/openmrs-cpm.git 
2. Clone your project to a directory (using GitHub client or command line below)
   

   git clone http://github.com/yourUsername/openmrs-cpm.git

3. Go into the newly cloned folder
   

   cd  openmrs-cpm

4. Add the main project as a remote branch (convention typically calls it "upstream" as shown below)
   

   git remote add upstream https://github.com/OpenMRS-Australia/openmrs-cpm.git

5. Make your changes and commit them locally
   1. To add a new file
      

      git add fileName

   2. To commit your changes
      

      git commit -m "This is a commit message. Make it descriptive" 

6. Push your local changes to your GitHub.com account
   

   git push origin master 

7. To contribute back to the main project,
   1. Retrieve latest changes from the main project
      

      git pull upstream master

   2. Resolve conflicts (if any)
   3. Commit changes
8. Go to your GitHub.com repot (http://github.com/yourUsername/openmrs-cpm.git) and to make a pull request

Useful Links

Interactive tutorial: https://try.github.io/

Cheat Sheet: https://training.github.com/kit/downloads/github-git-cheat-sheet.pdf