This book follows a Cookbook approach. It contains recipes with a lot of practical examples with clear explanations and step-by-step approach to building small-to-large scalable applications in Flask. Written in an easy to understand manner with loads of small applications included to get the feel of the code, this book can also serve as a supplementary material to develop hands-on skills in academic courses on web application development. If you are a web developer who wants to learn more about developing applications in Flask and scale them with industry-standard practices, this is the book for you. This book will also act as a handy tool if you are aware of Flask's major extensions and want to make the best use of them. It is assumed that you have knowledge of Python and a basic understanding of Flask.