Split testing allows you to experiment with different designs and track conversions to determine which one is the most effective. Learn how to do A/B testing using Split in this episode. (10 minutes)

If you are tired of the browser vendor prefixes in CSS, check out Bourbon. It provides Sass mixins and functions to make CSS more convenient. (7 minutes)

Easily generate complex forms with SimpleForm. Here I show how to convert bulky markup into a concise list of fields, customize it by passing options, and add error handling. (9 minutes)

This episode continues on the Twitter Bootstrap project showing how to display flash messages, add form validations with SimpleForm, customize layout with variables, and switch to using Sass. (12 minutes)

Twitter Bootstrap can help make beautiful web apps quickly by providing you with useful CSS and JavaScript. Here you will learn how to include it into Rails with the twitter-bootstrap-rails gem. (10 minutes)

Simple password authentication is easy to do with has_secure_password. Here you will learn how to make a complete Sign Up, Log In, and Log Out process as well as restrict access to certain actions. (13 minutes)

MiniTest is a fast and lightweight testing library. Here you will learn how to use it in a Rails app for model, helper, and integration testing. The Turn gem is also demonstrated for prettier test output. (15 minutes)

ActiveAttr provides what Active Model left out. If you need to create a table-less model with features similar to Active Record, watch this episode. (5 minutes)

If you need to cache a certain section of a page instead of the entire page, fragment caching is the way to go. Learn how caching is stored, how to create auto expiring caches, and more. (9 minutes)

In the second part of this two part series on Backbone.js, we finish up the Raffler application. Included is how to create entries through a form, respond to events, extract sub-views, pre-populate records, visit routes, and more. (24 minutes)