When you create a new app, you will be prompted to add your first data source:
These are the data sources we currently support:
See the related articles below for instructions on how to connect these data sources:
You can connect additional bases/sheets from Setup Home by selecting 'New data source'.
The tables from all of your data sources will sit alongside each other in your navigation bar. You can create links between your data sources using Stacker relationships - see instructions in the article below: