[Backport 13.4] [TASK] Make introduction quick and short (#5091)

* [TASK] Make introducition quick and short

Releases: main, 13.4, 12.4

* [TASK] Add minor language corrections

Releases: main, 13.4, 12.4

---------

Co-authored-by: lina.wolf <[email protected]>
Co-authored-by: Sarah McCarthy <[email protected]>

Documentation/ApiOverview/SystemOverview/Index.rst

@@ -0,0 +1,61 @@
+..  include:: /Includes.rst.txt
+
+.. _system-overview:
+.. _overview:
+
+===============
+System Overview
+===============
+
+The TYPO3 system is multi-layered. The backend and frontend user interfaces
+sit on top of the application layer, which in turn sits on top of the infrastructure
+layer. The webserver, database and PHP in the infrastructure layer are
+prerequisites for running TYPO3.
+
+The TYPO3 Core primarily consists of an API (Application Programming Interface),
+which defines a framework for managing content in the project. The API
+includes functionality for content storage, user permissions and access, content
+editing, and file management. This functionality is delivered via system
+**extensions** that use the API. All of the content is stored in a database
+that TYPO3 accesses via the API.
+
+Extensions are clearly defined parcels of code, such as plugins, backend
+modules, application logic, skins, and third-party apps.
+
+The most important thing to note is that the TYPO3 CMS consists solely
+of extensions. The most basic functions are packaged in a system extension called
+"core".
+
+.. figure:: /Images/Graphics/Typo3CmsStructure.svg
+   :alt: TYPO3 System layers diagram
+   :class: with-border
+   :width: 800px
+
+   Diagram showing the layers of the TYPO3 system
+
+.. _system-overview-application:
+
+Application layer
+=================
+
+The TYPO3 Core framework interacts with system and 3rd party extensions via
+the TYPO3 extension API.
+
+The core and extensions interact with each other seamlessly and operate as a
+single, unified system.
+
+.. _system-overview-ui:
+
+User interface layer
+====================
+
+The backend is the **content-creation** side. It is an administrative area
+where you can manage content and configuration based on the extensions that are
+installed.
+
+The frontend is the **content-delivery** side. Typically a website, it is the
+meeting point for templates, CSS, content, and logic from extensions,
+delivering your project to the world.
+The frontend doesn't have to be a website, it can be a native mobile
+application, a web application built in a frontend framework, or an API to
+interface with other systems.

Documentation/Introduction/Index.rst

@@ -1,83 +1,51 @@
 .. include:: /Includes.rst.txt
-
 .. _introduction:
 
 ============
 Introduction
 ============
 
-.. _system-overview:
-.. _overview:
-
-System Overview
-===============
-
-The TYPO3 system is multi-layered. The backend and frontend user interfaces
-sit on top of the application layer, which in turn sits on the infrastructure
-layer. The webserver, database and PHP in the infrastructure layer are
-prerequisites for running TYPO3.
-
-TYPO3 Core primarily consists of the API (Application Programming Interface),
-which defines a framework for managing the project content. The base features
-of the API include content storage, user permissions and access, content
-editing, and file management. These features are delivered via system
-**extensions** that use the API. All of the content is stored in a database
-that TYPO3 then accesses via the API.
-
-Extensions are clearly confined code additions, such as plugins, backend
-modules, application logic, skins, and third-party apps.
-
-The most important thing to note is that everything is an extension in TYPO3
-CMS. Even the most basic functions are packaged in a system extension called
-"core".
+TYPO3 is a content management system based on PHP.
+The :ref:`TYPO3 - Getting Started Tutorial <t3start:start>` gives you an
+introduction to the core concepts of TYPO3 and will help you to kickstart your
+first project.
 
-.. figure:: /Images/Graphics/Typo3CmsStructure.svg
-   :alt: TYPO3 System layers diagram
-   :class: with-border
-   :width: 800px
+.. _introduction-installation:
 
-   Diagram showing the layers of the TYPO3 system
+A basic TYPO3 installation
+==========================
 
+Installation with Composer is covered in the Getting Started Guide
+(see :ref:`Installation <t3start:installation_index>` chapter).
 
-Application layer
------------------
+You can also `download TYPO3 from our official page <https://get.typo3.org/version/13>`_
 
-The TYPO3 Core framework interacts with system and 3rd party extensions via
-the TYPO3 extension API.
+If you are starting out we would suggest using the latest TYPO3 version with
+long term support.
 
-The core and extensions interact with each other seamlessly and operate as a
-single, unified system.
+.. _introduction-site-package:
 
-User interface layer
---------------------
+A basic site package
+====================
 
-The backend is the **content-creation** side. It is the administrative area
-where you manage content and configuration based on the extensions that are
-installed.
+To get started you need a basic
+`site package <https://docs.typo3.org/permalink/t3coreapi:site-package>`_.
 
-The frontend is the **content-delivery** side. Typically a website, it is the
-meeting place for templates, CSS, content, and logic from extensions,
-delivering your project to the world.
-The frontend doesn't have to be a website, it could be a native mobile
-application, a web application built in a frontend framework,  or an API to
-interface with other systems.
+You can use the `official Site Package Builder <https://get.typo3.org.ddev.site/sitepackage>`_
+to generate one for you or follow the :ref:`site package tutorial <t3sitepackage:start>`.
 
-.. _introduction-installation:
-
-A basic installation
-====================
+.. _introduction-getting-help:
 
-To follow this document, it might help to have a totally trimmed down
-installation of TYPO3 with *only* the Core and the required system
-extensions at hand.
+Getting help with TYPO3
+=======================
 
-The installation process is covered in the :doc:`Getting started
-Guide <t3start:Index>`.
-You should perform the basic installation steps and not install any
-distribution. This will give you the "lightest" possible version of TYPO3.
+`Meet the TYPO3 Community <Meet the TYPO3 Community>`_. You can chat with us
+`on Slack <https://typo3.org/community/meet/chat-slack>`_, go to meetings in
+your `local user group <https://typo3.org/community/meet/user-groups>`_ or
+meet us at `events <https://typo3.org/community/events>`_.
 
-In your basic installation, go to the :guilabel:`Admin Tools > Extensions`
-module. You will see all extensions installed by Composer are activated by
-default.
+You can discuss TYPO3 related questions in the https://talk.typo3.org/ forum.
 
-.. include:: /Images/AutomaticScreenshots/Introduction/ExtensionsMinimalList.rst.txt
+If you think you have found a bug in the TYPO3 Core code, have a look at our
+`issue tracker on forge <https://forge.typo3.org/projects/typo3cms-core/issues>`_
+where you can check if the bug has already been reported or not.