Authentication is important in certain web apps. In this tutorial, you'll build a simple web application and create user registration with Node.js.

Express is a popular Node.js web framework. In this tutorial, you will learn how to work with Express Router to create route handlers.

Learn how an Android Layout defines the visual structure for a user interface, such as the UI for an activity or app widget.

Firebase Storage provides secure file uploads and downloads for Firebase apps. Learn to build an Android app for uploading images to Firebase Storage.

Aside from building APIs, Node.js is great for building web applications. In this tutorial, you will build a web app that can serve as a local library.

Learn to write tests for an API built using Node.js and Express. At the end, you will be able to build functional and tested APIs in Node.js.

We often need to pass data between Activities of an Android app. Learn how Parcelable makes it easy to serialize classes for sharing between Activities.

Activities are a fundamental part of Android app development, and you need to understand their lifecycles. So learn all about the Activity lifecycle.

Intents are a fundamental topic for Android developers. In this tutorial, I'll teach you about intents from A-Z.