January 13, 2017 — Данное руководство поможет разобраться, как можно более гибко управлять оформлением виджетов с помощью плагина Widget CSS Classes.

Ссылка на плагин
https://ru.wordpress.org/plugins/widget-css-classes/

Примеры CSS-кода из видео:
.footer-widget-2 .widget_text .widget-title { color: #f00; }

#text-7 .widget-title { color: #00f; }

.red .widget-title { color: #f00; }

.blue .widget-title { color: #00f; }

September 25, 2014 — Widgets are a great way to deliver added content or functionality to a WordPress site. I’ll show you step-by-step how to create a simple custom widget then see how you can distribute theme with a theme or as a stand-alone plugin.

Presentation Slides »

September 11, 2014 — If you’ve used WordPress for very long chances are you’ve used these features before. This talk will cover how to configure widgets and menus and possibly show you some new tricks that you may not have known about. Aimed for beginners and intermediate users.

October 26, 2013 — You will get to know how to build widgets, extend the widget class and all the basic parts needed to build your own widget.

Presentation Slides »

October 28, 2009 — This video gives you a brief introduction and how-to for the Image Widget, available on all WordPress.com accounts.

A WordPress.com Support page detailing the widget is also available here.

October 3, 2009 — The RSS Links Widget allows you to easily add links to your blog’s post and comment RSS feeds in your sidebar. This will provide your readers with a quick way to obtain your blog feed URLs and subscribe to them as they wish (via a web browser or RSS reader, like Google Reader).

This quick tutorial will show you how to set it up and use it.

You can also view the Support page for this Widget.