Build your first flutter app

This document introduces Flutter, an open-source cross-platform app development framework created by Google. It discusses building apps using Flutter that can run on both Android and iOS with a single codebase. The document outlines some advantages of Flutter, like using one codebase for both platforms and easily handling different screen sizes. It also notes some disadvantages, like potentially limited tools/libraries and large file sizes. Resources for learning more about Flutter are provided at the end.