Let's see...
I disclose some biases/gifts, and then approve of a company that sells music equipment.
I then decided to not tell you about how guitar pickups work. Instead, I found a couple of other people who explain it pretty well - and approve of their content. I link to a third site, which is probably more interesting to the average guitarist that's concerned about pickups.
I then linked to a scholarly work about the science of stringed instruments. It's a giant PDF, but a pretty nice book. I've read (most of) it and find myself flipping through it every so often. I was able to find it online and in PDF format, but I still provided the link for people to buy it (should they want a physical copy). It's a bit expensive but the physical copy is nice for when you're just lounging around and reading books on a computer isn't something I enjoy much.
https://playguitar.gq/2018/09/14/thebuddha-approves-3-how-do-guitar-pickups-work/
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