[TASK] Description about TCA (#478)

* [TASK] Description about TCA

---------

Co-authored-by: Maike Kiebele <[email protected]>
Co-authored-by: Lina Wolf <[email protected]>

Author: 3 people

Documentation/Concepts/Index.rst

@@ -30,31 +30,24 @@ TYPO3 Concepts
         ..  card-footer:: :ref:`Quick introduction to Fluid <fluid-templates>`
             :button-style: btn btn-secondary stretched-link
 
-    ..  card:: Webroot and assets
+    ..  card:: TCA
 
-        In TYPO3 files that are displayed in the web browser, must - for
-        security reasons - be placed in certain directories.
+        TCA (Table Configuration Array) in TYPO3 is a configuration system that
+        defines the structure, behavior, and appearance of database tables and
+        their fields in the backend, impacting how data is stored, validated,
+        and displayed.
 
-        ..  card-footer:: :ref:`Webroot and assets - where to put public files <webroot>`
+        ..  card-footer:: :ref:`Quick introduction to TCA <tca>`
             :button-style: btn btn-secondary stretched-link
 
-    ..  card:: Backend
+    ..  card:: Webroot and assets
 
-        The backend in TYPO3 is the administrative interface where users
-        manage content, configure settings, and control the overall
-        structure and functionality of the website.
+        In TYPO3 files that are displayed in the web browser, must - for
+        security reasons - be placed in certain directories.
 
-        ..  card-footer:: :ref:`Backend <backend>`
+        ..  card-footer:: :ref:`Webroot and assets - where to put public files <webroot>`
             :button-style: btn btn-secondary stretched-link
 
-    ..  card:: Frontend
-
-        The frontend in TYPO3 refers to the part of the website that visitors
-        see and interact with, including all visual elements and
-        content displayed in the browser.
-
-        ..  card-footer:: :ref:`Frontend <frontend>`
-            :button-style: btn btn-secondary stretched-link
 
 ..  toctree::
     :caption: Topics
@@ -64,6 +57,7 @@ TYPO3 Concepts
 
     TypoScript/Index
     Fluid/Index
+    TCA/Index
     Assets/Index
     Backend/Index
     Frontend/Index

Documentation/Concepts/TCA/Index.rst

@@ -0,0 +1,53 @@
+..  include:: /Includes.rst.txt
+
+..  _tca:
+
+===============================
+TCA (Table Configuration Array)
+===============================
+
+In TYPO3, TCA stands for Table Configuration Array. It is a core part of the
+TYPO3 framework that defines how data is stored, displayed, and managed within
+the TYPO3 backend. TCA is essential for customizing and configuring how TYPO3
+handles database tables and how content is presented in the backend interface.
+
+The TCA is essentially a large PHP array that
+defines the structure of database tables and their fields within TYPO3.
+It controls how data is displayed in forms, how records are listed,
+and how data validation and processing are handled. TCA is used to configure
+not only custom tables but also many of the core tables within TYPO3,
+like tt_content, which manages page content.
+
+..  _tca-what-is::
+
+What is TCA used for?
+=====================
+
+TCA is used to:
+
+*   TCA lets you define the fields of a database table, specifying data types, labels, default values,
+    and constraints. You can configure various input types like text fields, checkboxes, and dropdowns.
+*   TCA controls how forms are rendered in the TYPO3 backend. It defines the fields that are shown, their layout,
+    and whether they are required or optional.
+*   TCA allows developers to enforce validation rules on fields to ensure data integrity. For example, you can set a
+    field to only accept numeric values or enforce a specific character limit.
+*   TCA supports defining relationships between tables, such as one-to-one, one-to-many, and many-to-many relations.
+    It manages how records from related tables are linked and displayed in the backend.
+*   TCA, you can control which fields and records are editable, based on user roles and permissions.
+*   Extend existing tables and create new ones with custom field definitions
+
+For example, when you create a new content element or extend an existing one,
+you define the fields using TCA in the Configuration/TCA directory of your extension.
+TYPO3 then uses this configuration to build the backend interface for editors.
+
+..  _tca-more-information:
+
+Where to find more information
+==============================
+
+To learn more about TCA and how to use it in your TYPO3 projects, you can refer to the official
+TYPO3 documentation:
+
+*   :ref:`TYPO3 TCA Reference <t3tca:introduction>`
+*   :ref:`Database records <t3coreapi:database-records>`
+*   :doc:`Relations <t3coreapi:ExtensionArchitecture/Extbase/Reference/Domain/Model#relations>`