This Apple app review site does not really need a Help section. From the Home page choose the category of app you are interested in (Mac, iPadOS, and iOS - iPadOS and iOS only - Mac only - Apple Watch only) and read the details of the app in which you are interested.
You can click on the link following
to see screenshots or click on the brief description to see more details.
See the About tab for details of how the apps are chosen and reviewed.