Create sharepoint list and columns at below:
Login to https://make.powerapps.com/
Click to Apps in left menu >> click New app >>
Canvas
Choose SharePoint data
Click on new connection or choose available connection
>> Input site url >> Go
Choose sharepoint list
Waiting connect data to sharepoint
This is default screens (create, view, list)
Click F5 to run app >> choose plus icon
Input data >> save
Data appear on gallery and sharepoint list
Edit data
Data was updated.