Hopefully not text books that were published in the last 2 years because those risk being written by ai too.

We've reached the carbon dating limit of human knowledge since nothing can now be varied as written by a human unless you personally watched them do it.

I don't know anything about gardening, but for electronics I can recommend practical electronics for inventors and Atari "the book." Its focused on arcade cabinet repair but definitely has useful info for basic circuit troubleshooting that is aplicable today.

It helps to set your search parameters to include results that are older than like 5 years.

There's an anti-AI filter for uBlacklist