Arduino for Everybody - freeCodeCamp.org YouTube Video Course
https://www.freecodecamp.org/news/arduino-for-everybody/
This looks like a good entry point for people that want to get into embedded software with a course on Arduino hardware fundamentals.
It's a 10 hour course that includes 14 hands on projects.
Arduino for Everybody - Course Summary
Arduino for Everybody - Direct link to video
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