```bash
$ git add modified_file.py
$ git commit -m "A descriptive message about your changes."
```  
It is a good idea to sync your copy of the code with the original
repository regularly. This way you can quickly account for changes:  
```bash
$ git pull upstream main
```  
Push the changes to your account using:  
```bash
$ git push -u origin a-descriptive-name-for-my-changes
```  
6. Once you are satisfied, go to the
webpage of your fork on GitHub. Click on 'Pull request' to send your changes