I'd start from this - https://www.coursera.org/specializations/advanced-embedded-linux-development https://www.coursera.org/specializations/advanced-embedded-l.

I'd start from this - https://www.coursera.org/specializations/advanced-embedded-linux-development https://www.coursera.org/specializations/advanced-embedded-l... I studied under him at the university. He's also active in open source communities around embedded space.