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.
I second the recommendation for "Molecular Biology of the Cell" if you want to know how cells work, which is a pretty interesting and important subject. One thing I like about this book is that it's clear about what we don't know, and there is a lot. (It's interesting to read books from before a discovery (e.g. geology books before continental drift) and see if they acknowledge something is unknown or if they confidently give the wrong answer.)
