During the past month, I've started two threads about these topics. They generated good responses, indicating a wide interest. So I'm offering the results of my research over the last month here.
For books, I can recommend "Essential Home Security" by Stan Wasilik.
The website is better regarding hardware. The site is not just a front for preferred products that it sells. It offers great tutorials and unbiased reviews of commercial systems.
I'm not claiming that this book or site is the very best. But they are excellent starting points, and together probably offer all the information you need.
One tidbit I gleaned from another source has to do with garage doors operated by electric openers. Pretty well explained here:
R1