diff --git a/typo3/sysext/backend/Classes/Utility/BackendUtility.php b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
index be951f89d86cf0e1b09bd6425b7a83a58319c34d..d373bd975de0fe4acd3d98f8b02f152e5b69188e 100644
--- a/typo3/sysext/backend/Classes/Utility/BackendUtility.php
+++ b/typo3/sysext/backend/Classes/Utility/BackendUtility.php
@@ -2587,7 +2587,6 @@ class BackendUtility
 
     /**
      * Returns a selector box "function menu" for a module
-     * See Inside TYPO3 for details about how to use / make Function menus
      *
      * @param mixed $mainParams The "&id=" parameter value to be sent to the module, but it can be also a parameter array which will be passed instead of the &id=...
      * @param string $elementName The form elements name, probably something like "SET[...]
@@ -2881,7 +2880,6 @@ class BackendUtility
      * Returns an array which is most backend modules becomes MOD_SETTINGS containing values from function menus etc. determining the function of the module.
      * This is kind of session variable management framework for the backend users.
      * If a key from MOD_MENU is set in the CHANGED_SETTINGS array (eg. a value is passed to the script from the outside), this value is put into the settings-array
-     * Ultimately, see Inside TYPO3 for how to use this function in relation to your modules.
      *
      * @param array $MOD_MENU MOD_MENU is an array that defines the options in menus.
      * @param array $CHANGED_SETTINGS CHANGED_SETTINGS represents the array used when passing values to the script from the menus.
diff --git a/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php b/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
index 52fc201d22a0d3fee3beaa5a7e3a3560caa51d62..8c9185607fb2dc60d8c85b4f3131e5e35de02c75 100644
--- a/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
+++ b/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
@@ -46,8 +46,6 @@ use TYPO3\CMS\Core\Utility\GeneralUtility;
  * This class is used to authenticate a login user.
  * The class is used by both the frontend and backend.
  * In both cases this class is a parent class to BackendUserAuthentication and FrontendUserAuthentication
- *
- * See Inside TYPO3 for more information about the API of the class and internal variables.
  */
 abstract class AbstractUserAuthentication implements LoggerAwareInterface
 {
diff --git a/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php b/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
index 2bca0908bccd84ef4461ea6040b9a00cfaca88be..d8a90aa3d769f8a5218786ae4c9970cd30f39f31 100644
--- a/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
+++ b/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
@@ -648,7 +648,6 @@ class BackendUserAuthentication extends AbstractUserAuthentication
      * Returns TRUE if the $value is found in the list in a $this->groupData[] index pointed to by $type (array key).
      * Can thus be users to check for modules, exclude-fields, select/modify permissions for tables etc.
      * If user is admin TRUE is also returned
-     * Please see the document Inside TYPO3 for examples.
      *
      * @param string $type The type value; "webmounts", "filemounts", "pagetypes_select", "tables_select", "tables_modify", "non_exclude_fields", "modules", "available_widgets"
      * @param string $value String to search for in the groupData-list
diff --git a/typo3/sysext/core/Classes/Localization/LanguageService.php b/typo3/sysext/core/Classes/Localization/LanguageService.php
index edcdc3cb09132ce258269ebe5ab1ac355b553354..ea68a75e5df393efea66def80e8df86804203381 100644
--- a/typo3/sysext/core/Classes/Localization/LanguageService.php
+++ b/typo3/sysext/core/Classes/Localization/LanguageService.php
@@ -37,9 +37,6 @@ use TYPO3\CMS\Core\Utility\GeneralUtility;
  * As TYPO3 internally does not match the proper ISO locale standard, the "locale" here
  * is actually a list of supported language keys, (see Locales class), whereas "english"
  * has the language key "default".
- *
- * For detailed information about how localization is handled,
- * please refer to the 'Inside TYPO3' document which describes this.
  */
 class LanguageService
 {
diff --git a/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php b/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
index 189d988dac4adf540a7b970534a5a8eacb810e21..f6330e420a58edd8f038b338eb2cd358546a150f 100644
--- a/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
+++ b/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php
@@ -959,9 +959,8 @@ class ExtensionManagementUtility
     }
 
     /**
-     * Adds a "Function menu module" ('third level module') to an existing function menu for some other backend module
-     * The arguments values are generally determined by which function menu this is supposed to interact with
-     * See Inside TYPO3 for information on how to use this function.
+     * Adds a "Function menu module" ('third level module') to an existing function menu of some other backend module.
+     *
      * FOR USE IN ext_tables.php FILES
      *
      * @param string $modname Module name
diff --git a/typo3/sysext/core/Configuration/DefaultConfiguration.php b/typo3/sysext/core/Configuration/DefaultConfiguration.php
index d8eb067c46935919bfe296afd33052b4f4ea0ac3..bce60f947ab9f136f464ae7c6b73fb6711fac1b7 100644
--- a/typo3/sysext/core/Configuration/DefaultConfiguration.php
+++ b/typo3/sysext/core/Configuration/DefaultConfiguration.php
@@ -261,7 +261,7 @@ return [
         'errorHandlerErrors' => E_ALL & ~(E_STRICT | E_NOTICE | E_COMPILE_WARNING | E_COMPILE_ERROR | E_CORE_WARNING | E_CORE_ERROR | E_PARSE | E_ERROR),
         'exceptionalErrors' => E_ALL & ~(E_STRICT | E_NOTICE | E_COMPILE_WARNING | E_COMPILE_ERROR | E_CORE_WARNING | E_CORE_ERROR | E_PARSE | E_ERROR | E_DEPRECATED | E_USER_DEPRECATED | E_WARNING | E_USER_ERROR | E_USER_NOTICE | E_USER_WARNING),
         'belogErrorReporting' => E_ALL & ~(E_STRICT | E_NOTICE),
-        'locallangXMLOverride' => [], // For extension/overriding of the arrays in 'locallang' files in frontend  and backend. See 'Inside TYPO3' for more information.
+        'locallangXMLOverride' => [], // For extension/overriding of the arrays in 'locallang' files in frontend  and backend.
         'generateApacheHtaccess' => 1,
         'ipAnonymization' => 1,
         'Objects' => [],
@@ -1458,7 +1458,7 @@ return [
         ],
     ],
     'USER' => [],
-    'SC_OPTIONS' => [ // Here you can more or less freely define additional configuration for scripts in TYPO3. Of course the features supported depends on the script. See documentation "Inside TYPO3" for examples. Keys in the array are the relative path of a script (for output scripts it should be the "script ID" as found in a comment in the HTML header ) and values can then be anything that scripts wants to define for itself. The key "GLOBAL" is reserved.
+    'SC_OPTIONS' => [ // Here you can more or less freely define additional configuration for scripts in TYPO3. Of course the features supported depends on the script. Keys in the array are the relative path of a script (for output scripts it should be the "script ID" as found in a comment in the HTML header ) and values can then be anything that scripts wants to define for itself. The key "GLOBAL" is reserved.
         'GLOBAL' => [
             'softRefParser' => [
                 'substitute' => \TYPO3\CMS\Core\Database\SoftReferenceIndex::class,
diff --git a/typo3/sysext/core/ext_tables.php b/typo3/sysext/core/ext_tables.php
index 62a1351565f8a528daabe7bdee5a00c330fa1028..93a034add8c42b381342d667550ac16951734b71 100644
--- a/typo3/sysext/core/ext_tables.php
+++ b/typo3/sysext/core/ext_tables.php
@@ -127,7 +127,7 @@ $GLOBALS['TBE_MODULES']['web'] = 'list';
  * $TBE_STYLES configures backend styles and colors; Basically this contains
  * all the values that can be used to create new skins for TYPO3.
  * For information about making skins to TYPO3 you should consult the
- * documentation found in "Inside TYPO3"
+ * documentation found at https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Configuration/GlobalVariables.html#confval-TBE_STYLES
  */
 $GLOBALS['TBE_STYLES'] = [];