A module is a set of PHP, JavaScript, and/or CSS files that extends site features and adds functionality. The Drupal core software comes with a set of modules that provide a range of features.

Composer is the preferred dependency management solution for PHP, is used by Drupal core, and is becoming increasingly popular for managing the modules and themes used for a Drupal project.

Comments are a content entity type that allows users to leave commentary associated with a specific piece of content.

Content modeling consists of identifying and constructing the different building blocks of data that compose the information on your site.

A content type is a subtype of the [content entity](link to Entity topic). When a content creator goes to add new content to the site, they are presented with a list of content types to choose from to get the appropriate form to fill out.

Drupal's content moderation and workflow tools allow you to configure and support a flexible multistep publication process.

An overview of some of our favorite Drupal documentation resources.

Fields are the building blocks of Drupal's powerful content modeling system. The Field API allows for the development of custom field types to suit almost any data display and collection needs.

Many sites require the ability to upload, manage, and display various assets like files, images, videos, and audio.

A multilingual site has more than 1 language that users interact with, either through the content, the user interface, or both.

Search engine optimization (SEO) is the process of optimizing your online content, so that your content will rank higher in organic (non-paid) search engine results.

Learn about Drupal’s configuration system and how to manage configuration with both the administrative user interface and command-line tools.

The process for keeping Drupal core and contributed modules and themes up to date with the latest security and minor version releases.

In order to run a Drupal site, the web server you are using must meet minimum technical requirements.

Search provides internal site keyword search for content and users.

As an open source project, Drupal depends on community contributions in many forms including documentation, code, translation, speaking, organizing events, mentoring others, and even donating money.

A site’s main navigation elements, whether they be in the header, footer, or sidebar, are composed of links built using Drupal's menu system. Drupal allows site administrators to build menus while also allowing module developers to add and alter menus in code.

A block is a reusable widget that is placed inside regions (layout containers) of your theme. Blocks can be used by site administrators on the Block layout admin page or provided by a module using the Plugin API.

A layout can describe how various components are arranged on various levels—from an entire page from the header to the footer, to just the “middle” where the dynamic content goes, to individual components. It can apply to templates for managed content or one-off designs for landing pages.

A reliable backup will allow you to restore your site if something goes wrong.