Toplevel modules 

Changed in version 14.0

The following toplevel modules are provided by the Core:

content: Content
All modules requiring a page tree by default. These modules are mostly used to manage content that should be displayed in the frontend.
site: Sites
Settings for the complete site such as redirects and site settings.
media: Media
All modules requiring a file system tree such as modules dealing with file metadata, uploading etc.
admin: Administration
By convention, modules in this toplevel section should only be accessible by admins. Therefore the configuration array of a module displayed here should always have the following key-value pair: 'access' => 'admin'.
system: System

By convention modules in this toplevel section should only be available for admins with system maintainer rights. Therefore the configuration array of a module displayed here should always have the following key-value pair: 'access' => 'systemMaintainer'.

In this toplevel section modules that deal with installing and updating the Core and extensions are available. System-wide settings are also found here.

In this toplevel section modules are situated that deal with backend user rights or might reveal security relevant data.

Register a custom toplevel module 

Toplevel modules like Content or Media are registered in the Configuration/Backend/Modules.php. All toplevel modules provided by the Core are registered in EXT:core so you can look at typo3/sysext/core/Configuration/Backend/Modules.php for reference.

Example: 

Register a new toplevel module in your extension:

EXT:my_extension/Configuration/Backend/Modules.php 
return [
    'myextension' => [
        'labels' => 'LLL:EXT:my_extension/Resources/Private/Language/locallang_mod_web.xlf',
        'iconIdentifier' => 'modulegroup-myextension',
        'navigationComponent' => '@typo3/backend/page-tree/page-tree-element',
    ]
];
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