3 Good Sites for PowerApps Gallery Aspects

The following are 3 useful sites for PowerApps gallery-based aspects:

Connect to SharePoint from a canvas app:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/connections/connection-sharepoint-online

Tutorial: Customize a gallery in Power Apps:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/customize-layout-sharepoint

Understand SharePoint forms integration:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/sharepoint-form-integration