Any idea which one website you would recommend for someone who has just bought a used Camry (2010) and who wants to learn about the things she can easily do to keep it running well? I think of Scotty but I wonder if there is someone else with a Toyota focus who can simplify things even more than he does.
Any place you know where she can find a good checklist that will help a DIYer. Or a good online class (though I'm not sure how much time she will invest in classes).
I buy one of these for every vehicle I own and throw it in the trunk. There is a lot of educational material in the intro chapter. Principles etc. The step-by-step pictures make repairs so easy.

more educational resources we've gathered:
https://carkiller.com/scottykilmer/qa/resources/
online community:
https://www.toyotanation.com/
i would start by going through the owners manual with her
You can also refer her to Toyota Master Mechanic The Care Care Nut’s Youtube Channel. Here’s some useful playlists for her:
https://m.youtube.com/playlist?list=PLeFzfl0Q8rQVtXIaJSF7EtirvTRhSbsrV
https://m.youtube.com/playlist?list=PLeFzfl0Q8rQWZjE9-i2oNRoEnBwQso5Bk
https://m.youtube.com/playlist?list=PLeFzfl0Q8rQXdHzZ43u3G82SspCgYhUpQ
that is one crazy transmission design