If you're new to Android Studio, start here: Part 1 walks through installing Android Studio 3.x and launching your first Android project ...

Android Studio is a developer kit that you can use to create and troubleshoot your own Android apps. We'll go over what it is (and what it isn't).

It's now possible to install and use Android Studio on Chrome OS. Use this handy guide to get started with making Android apps on your Chromebook.