Wordpress, themes and technical

Wordpress is both a host of blogs, Wordpress.com with million hosted blogs and also a software to install on its own hosting which can be downloaded from Wordpress.org.
There are other blogging software such as Dotclear, but Wordpress, through its many contributors has a very broad range of plugins and themes that make it nearly universal and provides almost all the features that we could ask for.
We can give it also a more generic use, building even a platform for e-commerce.

Themes

Cryonie

A classic, SEO-friendly, flexible-width theme for Wordpress.

Encyclopedia

Show categories in tags and display the list of last post for each category.

Creating your own theme for Wordpress
8-page tutorial on creating a theme with an example of implementation actually used in production.

How to modify a theme?
Using as example an easy to access a theme, we see how to find items to edit.

Tutorials

Installing Wordpress locally
To design a new template, to test something, it is useful to have a local version of your blog and work on it at no risk for the blog.

Custom fields tutorial and example
You can add scripts to your posts en enter parameters from the Edit panel.

Plugins

Plugins expand the possibilities of the software, but sometimes make it vulnerable. The Mossack Fonseca data leak that toppled governments is attributed to the Revolution Slider plugin which contained a security flaw giving access to content on the server.
Avoid unnecessary plugins if your site holds personal data. In other cases, the following list offers many possibilities ...

Sidepress
A Wordpress plugin to add news to a website without to change its actual structure.

Technical

How to speed up Wordpress
And eventually improve ranking, and user experience.

How to check the integrity of the Wordpress database tables
A script working on Wordpress and other CMS.

How to mass-delete users
Clean the database of all the spam accounts.

List of codes of widgets
The Wordpress interface consists of elements such as tag cloud, RSS and others. It is thus possible to build an interface to his liking.

Here is the list of codes of these elements with the list of components of a page too.

A smart 404 page
Something else to give users that a simple error message. With a file to download.

Understanding the .htaccess file
How Wordpress redirects URLs.