Upgrading is the process of moving your site from a previous major version of Drupal to a newer version, for example from Drupal 7 to Drupal 11.

Responsive web design is a set of design approaches and development best practices that ensures that a web design can be used on many types and sizes of devices.

Modules are bundles of primarily PHP code that extend Drupal in order to add new features or alter existing functionality.

Patches are used to describe modifications made to one or more code files, and can be used to share those changes.

Drupal includes the PHPUnit testing framework. This enables us to write unit and functional tests to attempt to minimize the number of bugs in our application.

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

Drupal's vendor-agnostic database abstraction layer provides an API that can query different underlying databases.

Tools and workflows for deploying code and configuration changes from one environment to another with Drupal-specific considerations.

Coding standards provide a set of rules for how your code should be formatted, and best practice guidelines for naming conventions and the location of files.

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

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

PHP: Hypertext Preprocessor (PHP) is a popular interpreted programming language that is especially suited for web development. Drupal core and all contributed modules are written in PHP.

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.

Drupal has an amazing community of people who create the software and help each other make the best use of it. This is one of the main benefits of using Drupal — and everyone should take advantage of that.

Development environments provide a sandbox where you can work on your application without affecting the live site.

Drush is a command line interface that enables you to interact with your Drupal site without clicking around the graphical user interface (GUI).

Drupal provides a standard, secured method for module developers to add forms to a Drupal website. Learn how to use the Form API to build, validate, and submit a custom form.

The PhpStorm integrated development environment (IDE) contains dozens of useful features that make working with a Drupal codebase easier.