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In case of errors or problems with the site, the <a href=":dblog">Recent log messages</a> page can be useful for debugging, since it shows the sequence of events. The log messages include usage information, warnings, and errors.
This log is not persistent
The Database Logging module logs may be cleared by administrators and automated cron tasks, so they should not be used for <a href=":audit_trail_wiki">forensic logging</a>. For forensic purposes, use the Syslog module.
What is a menu?
A menu is a collection of <em>menu links</em> used to navigate a web site. Menus and menu links can be provided by modules or site administrators.
Managing menus overview
The core Menu UI module provides a user interface for managing menus, including creating new menus, reordering menu links, and disabling links provided by modules. It also provides the ability for links to content items to be added to menus while editing, if configured on the content type. The core Custom Menu Links module provides the ability to add custom links to menus. Each menu can be displayed by placing a block in a theme region; some themes also can display a menu outside of the block system. See the related topics listed below for specific tasks.
Additional Resources
<a href="https://www.drupal.org/docs/user_guide/en/menu-concept.html">Concept: Menu (Drupal User Guide)</a>
Adding a link to a menu
Creating a menu
Reordering and disabling menu links
Configure menu settings for a content type
The Theme Switcher module allows you to create theme-switching rules which allow automatic selection of a theme based on Drupal 8 Conditions system. Because of this it can also be easily extended to support additional custom conditions exposed by other modules. In Drupal 8 conditions are no longer defined through a hook and they are plugins now.
What are updating, upgrading, and migrating?
<em>Updating</em> is the process of changing from one minor version of the software to a newer version, such as from version 8.3.4 to 8.3.5, or 8.3.5 to 8.4.0. Starting with version 8.x, you can also update to major versions 9, 10, and beyond if your add-on modules, themes, and install profiles are compatible. <em>Upgrading</em> is the process of changing from an older major version of the software to a newer version, such as from version 7 to 8. <em>Migrating</em> is the process of importing data into a site.
To upgrade a site from Drupal 6 or 7 to Drupal 8 or later, keeping the content and configuration the same, you will install the new version of the software and add-on modules and themes in a new site, and then migrate the content and other data from your old site into the new site.
Overview of Migrating
You can use the <em>Migration</em> group of modules to perform the migration step of upgrading from Drupal 6 or 7 to Drupal 8 or later, as well as other migrations. These modules also provide APIs that can be used by programmers to write custom software for migrations. Here are the functions of the core migration modules:
Migrate
Provides the underlying API for migrating data.
Migrate Drupal
Provides data migration from older versions of the core software into a new site.
Migrate Drupal UI
Provides a user interface for performing data migration from older versions of the core software into a new site.
If the source of the data you want to migrate is a different content management system, or if the data source is a site that was built using contributed modules that the core migration modules do not support, then you will also need one or more contributed or custom modules in order to migrate your data.
<a href="https://www.drupal.org/docs/upgrading-drupal">Upgrading Drupal</a>
The Migrate module provides a framework for migrating data, usually from an external source into your site. It does not provide a user interface. For more information, see the <a href=":migrate">online documentation for the Migrate module</a>.
The Contact module allows visitors to contact registered users on your site, using the personal contact form, and also allows you to set up site-wide contact forms. For more information, see the <a href=":contact">online documentation for the Contact module</a>.
Using the personal contact form