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Refcardz Spotlight

Refcard #249

GraphQL Essentials

As an alternative to REST, GraphQL is quickly gaining popularity as a tool for building APIs and fetching declarative data. This Refcard introduces GraphQL concepts...

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Refcard #339

The Essentials of GitOps

GitOps is an operational framework that leverages DevOps core practices used in application development, including version control, CI/CD, and collaboration, for...

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Refcard #338

Kubernetes-Native Database Essentials

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Refcard #292

Advanced Kubernetes

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Refcard #337

Java 15

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Building Maintainable and Scalable Software

Learn design patterns quickly with Jason McDonald's outstanding tutorial on the original 23 Gang of Four design patterns, including class diagrams, explanations, usage info, and real world examples.

Jason McDonald

244.6k 860.5k

A Power-User's Guide to Java

Gives you an overview of key aspects of the Java language and references on the core library, commonly used tools, and Java 8 features.

Cay Horstmann

154.1k 480k

The De Facto Standard for Version Control

Today, Git is effectively the de-facto standard for software version control, and it is truly an expected tool in every developer’s toolbox. This quick overview demonstrates what a rich and deep DVCS Git truly is, while still being approachable for the newcomer to this collaborative approach to source code and version control. Download this Refcard to learn about the essentials of getting started with Git like cloning existing projects, pushing Git commits to subversion, branching and merging, and more.

Matthew McCullough

161.2k 414.1k

The Representational State Transfer (REST) architectural style is a worldview that elevates information into a first-class element of architectures. REST allows us to achieve the architectural properties of performance, scalability, generality, simplicity, modifiability, and extensibility. This newly updated Refcard explains main HTTP verbs, describes response codes, and lists libraries and frameworks. It also gives additional resources to further explore each topic.

Brian Sletten

138.1k 316.6k

Unlocking Unobtrusive JavaScript

Introduces Ajax, a group interrelated techniques used in client-side web development for creating asynchronous web applications.

Dave Crane

105.8k 243.2k

The Most Popular Agile Methodology

Scrum is a framework that allows people to productively and creatively deliver products of the highest possible value. With over 70% of Agile teams using Scrum or Scrum hybrid, learn more about its benefits in managing complex product development. This newly updated Refcard explores the details of Scrum, including theory, values, roles, and events. It also includes a sample of a popular approach to deliver Integrated Increments in a scaled environment.

Dave West

108k 313.1k

Understanding the Core Concurrency Concepts

This Refcard will help Java developers working with multi-threaded programs to understand core concurrency concepts and how to apply them. Overview the key aspects of the Java language and get references on the core library.

Igor Sorokin

116.7k 302.9k

Dependency Injection in a Nutshell

Catalogs the XML elements available as of Spring 2.5 and highlights those most commonly used: a handy resource for Spring context configuration.

Craig Walls

110.5k 321.8k

First Steps in CSS

Covers Core principles of CSS that will expand and strengthen your professional ability to work with CSS. Part one of three.

Molly Holzschlag

95.7k 229.1k

The Core jQuery Reference

Introduces jQuery Selectors, which allow you to select and manipulate HTML elements as a group or as a single element in jQuery.

Bear Bibeault

97.2k 389.9k

Test and Debug Code With Java’s Leading IDE

Eclipse IDE is a cross-platform, multi-purpose, open-source Integrated Development Environment. It is widely used to develop projects in Java, JavaScript, PHP, C++, Scala, and many others. This newly updated Refcard breaks down installing, setting up, and getting started with Eclipse. It also covers productivity tips, creating new projects and files, accessing Source Control Managers, and debugging configurations.

Mickael Istria

87.3k 258.2k