Learning Objective: By the end of this module you will learn the pros and cons of hybrid mobile development. You will learn about React Native and how it has solved problems of performance when compared to previous hybrid development frameworks. You will set up the environment and create a first react native application using expo and react native CLI. You will also learn how to debug RN app. A word on hybrid mobile development What is React Native Preparing development environment                 Node, Watchman, Xcode, Android Studio                          React Native CLI   Creating and Running HelloWorld React Native               Birds view on mobile platforms iOS and android              First Debugging steps