What got me started was probably this from "The Thought Emporium", and other videos on his channel: https://www.youtube.com/watch?v=J3FcbFqSoQY (obvious don't try this at home disclaimer).

What I'm reading right now is "Molecular Biology of the Cell" — it's a dense textbook and I'm taking my time, so only about two chapters in, but I love how it focuses on a lot of fundamental principles and occasionally points out astonishing facts.

There's also this series which might be a nice, casual primer: https://www.youtube.com/playlist?list=PL3EED4C1D684D3ADF

James Somers also lists some other books in his post I linked to above, might be worth checking out.