Once you have created and built your app with the sheets and data visualizations you want it to have, you need to fine-tune it for others to use in an easy and efficient manner.
This fine-tuning involves things such as creating reusable master items (visualizations, dimensions and measures), using bookmarks to keep track of important and interesting data selections and connections, and adding a title, description and a thumbnail for the app to make it easier to recognize from the hub.