Hobbyist here. I recommend... Books: - Simon Monk's Electronics Cookbook [1] - Michael Margolis' Arduino Cookbook [2] Youtube: - GreatScott's Basics Playli

Hobbyist here. I recommend... Books: - Simon Monk's Electronics Cookbook [1] - Michael Margolis' Arduino Cookbook [2] Youtube: - GreatScott's Basics Playlist [3] The concepts in those two books are useful for interfacing with any microcontroller, including NodeMCU and STM32s. [1]: https://www.amazon.com/Electronics-Cookbook-Practical-Electronic-Raspberry/dp/1491953403#reader_1491953403 https://www.amazon.com/Electronics-Cookbook-Practical-Electr... [2]: https://www.amazon.com/Arduino-Cookbook-2nd-Michael-Margolis/dp/1449313876#reader_1449313876 https://www.amazon.com/Arduino-Cookbook-2nd-Michael-Margolis... [3]: https://www.youtube.com/watch?v=woTiKij76cA&list=PLAROrg3NQn7cyu01HpOv5BWo217XWBZu0 https://www.youtube.com/watch?v=woTiKij76cA&list=PLAROrg3NQn...