In addition to the over 500 community samples a lot of people don’t realize the product comes with a plethora (in case you ever wondered how many is a “Plethora”: in this case it is 34<g>) of amazing samples and templates.
To use the built-in samples and templates, log into PowerApps.com.
Then from the home screen select “All Templates”.
Note: This the same selecting “Create” on the left most navigation.
Scroll about 1/3 of the way down and you will find the built in application templates.
If you are looking for a suggestion/starting point the training template is hard to beat!
Note: this does not include the Project Oakdale templates!
Those are even easier to locate and use as they are called out in the documentation here!
Remember if you have need training on Power Apps you can find that here: https://aka.ms/powerappstraining