1. Open github.com. If alreay account you can sign in otherwise you have to create a account.
2. Click on New Repository (or go to GitHub New Repository).
3. Enter a repository name and optional description.
4. Choose Public or Private. As your wish.
5. Click Create Repository.
6. git clone https://github.com/YOUR_USERNAME/REPO_NAME.git
or you can follow this instructions
git init
git remote add origin https://github.com/YOUR_USERNAME/REPO_NAME.git
git add .
git commit -m “Initial commit”
git push -u origin master
8. now you can check github account
9. for branch add
git branch branchname(b1)
10. change branch. git checkout b1
11. branch merge. git merge b1
12. to work other person project, you have to fork.
then clone repo. then same process.
then pull request