Comment by PyroLagus

The first half of nand2tetris[1] (projects 1-6), which corresponds to their first Coursera course[2] is a great introduction to the digital side of electronics. The second half is more general purpose computer and OS specific but probably still pretty useful. I've only finished up to chapter 5 as of right now, so I can't say anything definite.

[1] https://www.nand2tetris.org/

[2] https://www.coursera.org/learn/build-a-computer