This module is basically the Drupal 7 successor to CCK 3's Multigroup in Drupal 6. A similar module is the Inline Entity Form. Caution: ...

By using the version of Geshi found at https://github.com/easybook/geshi , Sass and Twig syntax highlighting can be added to text fields in Drupal.

Let's you create, edit, and delete entity references from any form that includes an entity reference field.

This module might not work well with translation and workbench moderation.

Also see Field Collection

"This module provides an advanced Entity Reference widget that uses a view embedded in a modal dialog for selecting items. The view can be paginated and have exposed filters."

"The Media module provides an extensible framework for managing files and multimedia assets, regardless of whether they are hosted on your own site or a 3rd party site - it is commonly referred to as a 'file browser to the internet'.

Media is a drop-in replacement for the Drupal core upload field with a unified User Interface where editors and administrators can upload, manage, and reuse files and multimedia assets....

Here are some common settings for HTMLawed that can be used as a more lenient 'filtered html' format for trusted editors that need a simple WYSIWYG. This configuration allows images, which can be a security risk. If you don't understand the risk, then leave Drupal's defaults the way they are and perhaps try to work with the Full HTML format or use CSS classes and stylesheets.

The htmLawed module enables the use of the htmLawed(X)HTML filter/purifier with text/input formats.

This module lets you use very fine grained html filtering.

See /docs/common-htmlawed-settings for common settings.

This modules provides a widget called Multiple Selects list for reference and list types fields.

The description at Drupal.org describes this module the best:"This module creates separate "Edit account" and "Edit profile" tabs for each user, with custom user fields configured under "Edit profile."

Here are some examples of using Drupal's states API. It shows the use of OR and XOR (which only work with jQuery 1.8 or above, apparently). More examples can be found in the examples project in the form example module.