As always, once you have a working project notebook, you can click on File then Save to save your work. The next step is to share your notebook by clicking on the Share icon, as shown in the following screenshot):
From there, you can select the way you want to share your notebook:
You should get into the habit of documenting your notebooks with Markdown cell content before sharing it. You will be surprised how much better your work will be received if you add commentary and perspective to each cell.
Finally, when you view your project notebooks (see the following screenshot), note the SHARED and STATUS icons. You can publish your notebook to various target environments, such as GitHub:
