Check out Real Python @ https://realpython.com/ to learn Python and web development (including Flask and Django) through hands-on, interesting examples that are useful and fun! (I am the co-founder/author)

On the fence? Check out these free resources, developed by the Real Python team-

1. Free tutorials and resources >> https://realpython.com/resources/

2. DiscoverFlask >> http://discoverflask.com - Full Stack Web Development with Flask

3. Flaskr >> https://github.com/mjhea0/flaskr-tdd - Intro to Flask, Test Driven Development (TDD), and jQuery