[Backport 13.4] Description about Cache and how to clear cache (#527)

* [TASK]: Description about Cache and how to clear cache

* [TASK]: Add card in TYPO3 Concepts about cache

* [TASK]: Adjust heading

* [TASK] Adjust headings

* [TASK] Correct cache

---------

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

Author: github-actions[bot]

Documentation/Concepts/Cache/Index.rst

@@ -0,0 +1,58 @@
+:navigation-title: Cache
+..  include:: /Includes.rst.txt
+
+..  _cache:
+
+=====
+Cache
+=====
+
+.. _what-is-caching:
+
+What is caching in TYPO3?
+=========================
+
+Caching is a process TYPO3 uses to temporarily store content and data to help
+your website load faster and perform efficiently. Instead of regenerating
+every page or content piece each time a visitor loads it, TYPO3 saves a
+"cached" version. This way, the system can quickly serve this saved content,
+reducing the load on the server and speeding up the response time for users.
+
+.. _how-to-clear-cache:
+
+How to clear caches in TYPO3?
+=============================
+
+When you update content or make configuration changes, TYPO3 sometimes needs a
+cache refresh to reflect these updates on the live site.
+Here are the main ways to clear caches in TYPO3 13:
+
+*   Clearing Cache in the backend:
+
+    *   In the Backend, look for the Clear cache icon, which resembles a
+        lightning bolt. You can find this in the top toolbar.
+
+        .. figure:: /Images/ManualScreenshots/ClearCache/Toolbar.png
+
+    *   For deeper cache management, you can use the Install Tool:
+        In :guilabel:`Admin Tools > Maintenance` you can find the option to
+        clear all caches. This will refresh everything, including caches
+        that aren't typically cleared through the backend toolbar.backend
+
+*   Clearing caches via Command Line
+
+    For advanced users or developers, caches can also be cleared from
+    the command line:
+
+    ..  code-block:: bash
+
+        ddev typo3 cache:flush
+
+.. _when-to-clear-cache:
+
+When should you clear caches?
+=============================
+
+*   If new content, images or text doesn't show up right away.
+*   When adjusting templates, extensions or system settings.
+*   While working on custom code, plugins or during site updates.

Documentation/Concepts/Index.rst

@@ -57,6 +57,15 @@ TYPO3 Concepts
         ..  card-footer:: :ref:`Extensions <concepts-extensions>`
             :button-style: btn btn-secondary stretched-link
 
+    ..  card:: Cache
+
+        The TYPO3 cache temporarily stores website data to improve loading
+        speed and reduce server load by delivering saved versions
+        of content to visitors.
+
+        ..  card-footer:: :ref:`Cache <cache>`
+            :button-style: btn btn-secondary stretched-link
+
 ..  toctree::
     :caption: Topics
     :glob:
@@ -70,6 +79,7 @@ TYPO3 Concepts
     Backend/Index
     Frontend/Index
     Extensions/Index
+    Cache/Index
     */Index
     *