As someone who pivoted into more computing-centric work from an unrelated scientific field, I can't recommend Ben's channel enough! The 6502 series really helped me put together a ground-up view of hardware that I don't think I could have gotten as quickly anywhere else. His networking series is a banger too.
(I had a decent circuitry background from my intro physics courses so YMMV)
(I had a decent circuitry background from my intro physics courses so YMMV)