I started the Microservices with Docker, Flask, and React a while ago.
The course proved to be quite challenging, as I'm not familiar with Docker and Flask. It also uses advanced features of React.
It was very fascinating for me to see how to develop a modern application with TDD, using Docker.
While the React part is a bit outdated (it still uses deprecated methods like
getDerivedState) - everything works and teaches you useful concepts.
At the moment, you can still get the course for $40. Money well spent, as the course offers tons of content and teaching material.
I'm not affiliated with the course author. But as a happy customer, I'm recommending this course.