TYPO3 Core

While trying to extend the admin panel, I stumbled across some issues where a hint in the documentation could have helped me.

• setting the custom module class to 'public' can be easily overlooked.
• custom main modules need to implement the ShortInfoProviderInterface to be visible in the module menu
• the current documentation mentions adding settings but does not explain that there are two different types (page settings and module settings) and how to add them properly