If you have wondered how to leverage your pre-existing Flutter/Dart development skills, then you will be happy to know you can now build dynamic, scalable, and adaptive web apps with Flutter! Flutter 2.0 is a big release - you can use Flutter and Dart to build adaptive web and desktop apps - all with a single codebase. In this course, you will learn how to leverage Flutter (Web) 2.0 and Dart and build a capstone app called DiaryBook. In this course, you will build a full-fledged, more complex, Flutter web app with Firestore; FirebaseAuth as the backend; create, authenticate, and log in users using Google Cloud FirebaseAuth; create, edit, delete, update diary entries with Cloud Firestore backend; use providers, StreamBuilders in Flutter web; learn how to implement basic and advanced routing in Flutter 2.0 web; finally, deploy Flutter web app to firebase hosting. By the end of this course, you will have all the tools and knowledge you will need to build adaptive Flutter web apps competently and easily port the same app into desktop apps on your own! All the code files and resources for this course are available at https://github.com/PacktPublishing/Flutter-Web---Build-a-Diary-Web-App-with-Flutter-and-Cloud-Firestore