Flask for Beginners

Learn Flask the Hard Way

Based on Flask 3.1.x
Optimized terminology and descriptions
Provides only the minimum information needed to get started
Uses a Watchlist application as the example project
Supports Python 3.9 and later on any operating system
Reproduces the complete development workflow, including every command and code block
Readers can follow the tutorial to build the complete example application themselves and eventually deploy it

The current version is 5.0 (released on September 20, 2026).

If you find any errors in the book, feel free to open an Issue or submit a Pull Request to fix them.

This book is licensed under the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 (CC BY-NC-ND 3.0) license. Commercial use, redistribution of modified versions, and redistribution without attribution are prohibited.