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the Application Development bundle

With the foundations laid by the previous Learn Enough tutorials, you're now ready to learn how to develop dynamic web applications. You’ll start by learning the elegant Ruby programming language, using it both for general-purpose programming and to make a simple web application. Then you’ll learn how to make professional-grade web applications with Ruby on Rails using the Rails Tutorial, the leading introduction to web development with Rails. In a final optional tutorial, you’ll learn how to use Action Cable to make real-time web apps that respond instantly to user input. By the time you finish these courses, you'll be ready to start work as a freelancer, get a job as a developer, or start a web-based company of your own.
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1270 pages
28 hours
31 chapters
354 videos
417 exercises

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Want to have your own copy of the Learn Enough tutorials? All of our tutorials are available as downloadable ebooks & videos as well as online courses. Buy the downloads once and keep them forever!

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All Learn Enough tutorials come with a 60-day 100% money-back guarantee. If for any reason you aren’t satisfied with any tutorial purchase, just let us know and we’ll refund your payment.

Want access to All the tutorials?

The Learn Enough Everything Bundle includes the entire Learn Enough introductory sequence and the full Ruby on Rails Tutorial. That’s over 2500 pages of book content and 53 hours of video that teaches you enough Command Line, Text Editor, Git, HTML, CSS & Layout, JavaScript, and Ruby to be dangerous, along with a comprehensive introduction to building profession-grade web applications with Ruby on Rails.

All Access Subscription include the course version of all the tutorials (streaming video, exercise answers, and progress tracking), and access to the Learn Enough Society to get help if you need it. 7 day free trial, cancel any time.

$ 49 /mo

Titles included in

The Application Development



Ruby is an elegant object-oriented programming language with applications ranging from shell scripting and package management to full-stack web application development. Learn Enough Ruby to Be Dangerous is designed to get you started writing practical and modern Ruby programs as fast as possible, with a focus on the real tools used every day by software developers.

Learn Enough Ruby to Be Dangerous broadly follows the structure of Learn Enough JavaScript to Be Dangerous, which can be studied either before or after this tutorial. Because many of the examples are the same, the tutorials reinforce each other nicely—there are few things more instructive in computer programming than seeing the same basic problems solved in two different languages.

To be productive with Ruby, you don’t have to know everything about it—you just have to learn enough to be dangerous.

Ruby on Rails (Rails 6)

The Ruby on Rails Tutorial teaches you how to develop custom web applications with the popular Ruby on Rails web framework. Since its launch in 2010, the Ruby on Rails Tutorial has been the leading introduction to web development with Rails.

The Ruby on Rails Tutorial is designed to give you a thorough introduction to web application development, including a basic grounding in Ruby, Rails, HTML & CSS, databases, version control, testing, and deployment—sufficient to launch you on a career as a web developer or technology entrepreneur. If you already know web development, this book will quickly teach you the essentials of the Rails framework, including MVC and REST, generators, migrations, routing, and embedded Ruby.

Action Cable

Learn Enough Action Cable to Be Dangerous teaches you how to use the WebSocket Protocol, a complement to the standard HyperText Transfer Protocol (HTTP) that creates a persistent connection between servers and clients, allowing two-way communication between them. The result is that WebSockets allow developers to create real-time applications such as chat apps and game servers that are far more interactive than ordinary web pages.

When using WebSockets, it’s nice to be able to have users log in, store their attributes in a database, render templates back to the browser, etc. In other words, it’s nice to have the power of a full-strength web framework like Ruby on Rails behind us. This is where Action Cable comes in. Action Cable gives us the best of both worlds: real-time communications with WebSockets combined with all the convenience and flexibility of Rails.

To be productive with Action Cable, you don’t have to know everything about it—you just have to learn enough to be dangerous.

About the Author

Michael Hartl

Michael Hartl is the creator of the Ruby on Rails Tutorial, one of the leading introductions to web development, and is cofounder and principal author at Learn Enough. Previously, he was a physics instructor at the California Institute of Technology (Caltech), where he received a Lifetime Achievement Award for Excellence in Teaching. He is a graduate of Harvard College, has a Ph.D. in Physics from Caltech, and is an alumnus of the Y Combinator entrepreneur program.

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