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

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

JavaScript files are included by a module or a theme by creating an asset library. Using this asset library system you can selectively choose which files to load, overwrite existing files, or customize them to suit your needs.

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.

Devel is a popular developer module containing a variety of developer and debugging utilities including Webprofiler, Devel generate and Kint.

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

Hooks allow modules to alter and extend the behavior of Drupal core, or another module. As a Drupal developer, understanding how to implement and invoke hooks is essential.

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.