Hey HN, I would love to get your feedback on my new course for React. It's an interactive platform (built on top of learnjavascript.online) that teaches React in the browser by explaining concepts step by step. The lessons are byte-sized and are followed up by practice challenges as well as flashcards that help you persist your knowledge. I also made it work on mobile so that students can read some lessons or even solve challenges while taking the train/metro. The whole platform is custom built (the text editors are open source projects).