You need the above steps only if the repository is private.

1. We Need to have our account in GitHub.
2. Need to create new repository in GitHub.
3. Based on the version, we need to create branch and push code in respective branch.
For example : If module is for v14, then create branch 14.0 and push code into that.
4. We must have account in odoo.com
5. Login required in odoo.com
6. Go to Upload module -> [Popup window will open up] -> paste our GitHub URL-> click on submit button
7. It will show list of publish repository and publish button
8. We need to click on that Publish button
9. Process will take little time -> Done