https://stellafane.org/tm/dob/index.html
One of my local astro club members lent me this book: https://www.amazon.com/Dobsonian-Telescope-Practical-Building-Telescopes/dp/0943396557
In addition to any other recommendations, I suggest these three books:
Practical Astronomy With Your Pocket Calculator
The Dobsonian Telescope: A Practical Manual for Building Large Aperture Telescopes
These three books will teach you the basics of positional astronomy, the basics of lenses and mirrors, and how they are made, the life cycle of stars.