--- title: Learn Computing from the Experts | The Rheinwerk Computing Blog | Rheinwerk Computing (27) description: Rheinwerk Computing is an imprint of Rheinwerk Publishing and publishes books by leading experts in the fields of programming, administration, security, analytics, and more. (27) --- [![Rheinwerk Computing Logo](https://blog.rheinwerk-computing.com/hubfs/computing_logo-header.svg)](https://blog.rheinwerk-computing.com/) [Blog](https://blog.rheinwerk-computing.com) - Books - Get an overview of our wide selection of books on every relevant computing topic. - [General Computing](https://www.sap-press.com/rheinwerk-computing/general-computing/) - [DevOps](https://www.sap-press.com/rheinwerk-computing/devops/) - [Programming Languages](https://www.sap-press.com/rheinwerk-computing/programming-languages/) - [Security](https://www.sap-press.com/rheinwerk-computing/security/) - [Software Development](https://www.sap-press.com/rheinwerk-computing/software-development/) - Book Subscription - Get unlimited access to all Rheinwerk Computing books! - [Programming Subscription](https://sap-press.com/subscriptions/) ![](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Write%20Your%20Own%20Python%20Functions.jpg?width=1000&name=How%20to%20Write%20Your%20Own%20Python%20Functions.jpg) [Featured](https://blog.rheinwerk-computing.com/tag/featured) | Featured article ## [How to Write Your Own Python Functions](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) Functions in Python provide functionality that you or someone else has already pro­grammed. In this post, we’ll teach you how to write your own Python functions. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-write-your-own-python-functions) ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) **Rheinwerk Computing** Rheinwerk Computing is an imprint of Rheinwerk Publishing and publishes books by leading experts in the fields of programming, administration, security, analytics, and more. # Blogs by Rheinwerk Computing [![Java Programming with Docker](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Java%20Programming%20with%20Docker.png?height=600&name=Java%20Programming%20with%20Docker.png)](https://blog.rheinwerk-computing.com/java-programming-with-docker) [Java](https://blog.rheinwerk-computing.com/tag/java) ## [Java Programming with Docker](https://blog.rheinwerk-computing.com/java-programming-with-docker) For many years, Java has been the number one in the *TIOBE index* of the most commonly used programming languages. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/java-programming-with-docker) [![Tools for Full Stack Developers](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Tools%20for%20Full%20Stack%20Developers.png?height=600&name=Tools%20for%20Full%20Stack%20Developers.png)](https://blog.rheinwerk-computing.com/tools-for-full-stack-developers) [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) ## [Tools for Full Stack Developers](https://blog.rheinwerk-computing.com/tools-for-full-stack-developers) For web application development, you need the right tools to make your work easier. Without the right tools, development would be a lot more time... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/tools-for-full-stack-developers) [![How to Create Link-Sensitive Graphics Like Image Maps with HTML](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Create%20Link-Sensitive%20Graphics%20Like%20Image%20Maps%20with%20HTML.png?height=600&name=How%20to%20Create%20Link-Sensitive%20Graphics%20Like%20Image%20Maps%20with%20HTML.png)](https://blog.rheinwerk-computing.com/how-to-create-link-sensitive-graphics-like-image-maps-with-html) [HTML & CSS](https://blog.rheinwerk-computing.com/tag/html-css) ## [How to Create Link-Sensitive Graphics Like Image Maps with HTML](https://blog.rheinwerk-computing.com/how-to-create-link-sensitive-graphics-like-image-maps-with-html) Link-sensitive graphics (also called *image maps*) are just links embedded within a graphic. Such an image map defined in HTML consists of three parts. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-create-link-sensitive-graphics-like-image-maps-with-html) [![Securing Linux Using 2FA with Google Authenticator](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Securing%20Linux%20Using%202FA%20with%20Google%20Authenticator.png?height=600&name=Securing%20Linux%20Using%202FA%20with%20Google%20Authenticator.png)](https://blog.rheinwerk-computing.com/securing-linux-using-2fa-with-google-authenticator) [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) ## [Securing Linux Using 2FA with Google Authenticator](https://blog.rheinwerk-computing.com/securing-linux-using-2fa-with-google-authenticator) In this blog post, we’ll show you how you can implement two-factor authentication for SSH on a Linux system. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/securing-linux-using-2fa-with-google-authenticator) [![How to Install Node.js on Windows, Mac, and Linux Systems](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Install%20Node.js%20on%20Windows%2c%20Mac%2c%20and%20Linux%20Systems.png?height=600&name=How%20to%20Install%20Node.js%20on%20Windows,%20Mac,%20and%20Linux%20Systems.png)](https://blog.rheinwerk-computing.com/how-to-install-node.js-on-windows-mac-and-linux-systems) [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) ## [How to Install Node.js on Windows, Mac, and Linux Systems](https://blog.rheinwerk-computing.com/how-to-install-node.js-on-windows-mac-and-linux-systems) The easiest way to install Node.js on your system is to use existing packages for your system. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-install-node.js-on-windows-mac-and-linux-systems) [![How to Get Started with HTML for Web Design](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Get%20Started%20with%20HTML%20for%20Web%20Design.png?height=600&name=How%20to%20Get%20Started%20with%20HTML%20for%20Web%20Design.png)](https://blog.rheinwerk-computing.com/how-to-get-started-with-html-for-web-design) [Video](https://blog.rheinwerk-computing.com/tag/video) ## [How to Get Started with HTML for Web Design](https://blog.rheinwerk-computing.com/how-to-get-started-with-html-for-web-design) Beginners often wonder what is needed to create web pages and learn HTML. This post will answer that question. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-get-started-with-html-for-web-design) [![Merge and Pull Requests in Git](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Merge%20and%20Pull%20Requests%20in%20Git.png?height=600&name=Merge%20and%20Pull%20Requests%20in%20Git.png)](https://blog.rheinwerk-computing.com/merge-and-pull-requests-in-git) [DevOps](https://blog.rheinwerk-computing.com/tag/devops) ## [Merge and Pull Requests in Git](https://blog.rheinwerk-computing.com/merge-and-pull-requests-in-git) Based on the feature branch model, the major Git platforms have extended the workflow to include merge/pull requests as integral parts. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/merge-and-pull-requests-in-git) [![How to Install Docker on Windows, Mac, and Linux Systems](https://blog.rheinwerk-computing.com/hs-fs/hubfs/How%20to%20Install%20Docker%20on%20Windows%2c%20Mac%2c%20and%20Linux%20Systems.png?height=600&name=How%20to%20Install%20Docker%20on%20Windows,%20Mac,%20and%20Linux%20Systems.png)](https://blog.rheinwerk-computing.com/how-to-install-docker-on-windows-mac-and-linux-systems) [DevOps](https://blog.rheinwerk-computing.com/tag/devops) ## [How to Install Docker on Windows, Mac, and Linux Systems](https://blog.rheinwerk-computing.com/how-to-install-docker-on-windows-mac-and-linux-systems) In this blog post, we’ll teach you how to install Docker on a Windows, Mac, or Linux system. ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/how-to-install-docker-on-windows-mac-and-linux-systems) [![The Principle of Ajax in JavaScript](https://blog.rheinwerk-computing.com/hs-fs/hubfs/The%20Principle%20of%20Ajax%20in%20JavaScript.png?height=600&name=The%20Principle%20of%20Ajax%20in%20JavaScript.png)](https://blog.rheinwerk-computing.com/the-principle-of-ajax-in-javascript) [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) ## [The Principle of Ajax in JavaScript](https://blog.rheinwerk-computing.com/the-principle-of-ajax-in-javascript) The name Ajax was first coined in 2005 by Jesse James Garrett in his essay "A New Approach to Web Applications." The idea is to use JavaScript for... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/the-principle-of-ajax-in-javascript) [![Twelve-Factor App Principles for Developers](https://blog.rheinwerk-computing.com/hs-fs/hubfs/Twelve-Factor%20App%20Principles%20for%20Developers.png?height=600&name=Twelve-Factor%20App%20Principles%20for%20Developers.png)](https://blog.rheinwerk-computing.com/twelve-factor-app-principles-for-developers) [HTML & CSS](https://blog.rheinwerk-computing.com/tag/html-css) ## [Twelve-Factor App Principles for Developers](https://blog.rheinwerk-computing.com/twelve-factor-app-principles-for-developers) As web applications became popular in the past two decades, many best practices and principles have emerged to develop and maintain web applications,... ![Rheinwerk Computing](https://blog.rheinwerk-computing.com/hubfs/RW-logo-300x300.png) by [Rheinwerk Computing](https://blog.rheinwerk-computing.com/author/rheinwerk-computing) [Read More](https://blog.rheinwerk-computing.com/twelve-factor-app-principles-for-developers) - - [1](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/1) - [...](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/22) - [25](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/25) - [26](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/26) - [27](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/27) - [28](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/28) - [29](https://blog.rheinwerk-computing.com/author/rheinwerk-computing/page/29) - ### Blog Topics - [All Topics](https://blog.rheinwerk-computing.com) - [Programming Languages](https://blog.rheinwerk-computing.com/tag/programming-languages) - [How To](https://blog.rheinwerk-computing.com/tag/how-to) - [DevOps](https://blog.rheinwerk-computing.com/tag/devops) - [Featured](https://blog.rheinwerk-computing.com/tag/featured) - [JavaScript](https://blog.rheinwerk-computing.com/tag/javascript) - [Cybersecurity](https://blog.rheinwerk-computing.com/tag/cybersecurity) - [What Is?](https://blog.rheinwerk-computing.com/tag/what-is) - [Artificial Intelligence](https://blog.rheinwerk-computing.com/tag/artificial-intelligence) - [Web Development](https://blog.rheinwerk-computing.com/tag/web-development) - [Software Development](https://blog.rheinwerk-computing.com/tag/software-development) **Subscribe to our blog!**Get notified about future blog updates. - - - ### Most Popular Blog Posts 1. 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