50 Subtle Mistakes to Screw Your Code and How to Avoid and Fix Them to Write Extraordinary Software for Web from the author of Practical Node.js, Pro Express.js, React Quickly, Full Stack JavaScript, free beginner friendly free indie book on TS.
Creating a dev bootcamp is not easy. I was there in almost the very beginning as a guest instructor. It's hard. Hack Reactor did a great job overall. It helped change the lives of many. The ROI is 200-300% over traditional CS degrees.
GitHub: https://github.com/azat-co/50-ts/ Leanpub (recommended: PDF+EPUB+updates via email): https://leanpub.com/50-ts