For the basics (note-reading, key names, fingers, chords, etc.), any adult beginner books I've seen will do the trick, check out some music stores. They start from knowing absolutely nothing, advancing incrimentally. The one on my shelf is called Alfred's Basic Adult Piano Course, it's level 1, there are three levels they use. It wasn't expensive.
This forum is a good resource, there's a lot of knowledge and ideas floating around. But it's unorganized, and takes forever to filter through. As a start, searching for posts by Bernhard are all good, he knows his stuff and wrote it down well. When I first got into piano, I basically scoured this forum for a few months, loading my head up with ideas and printing off the posts I liked best.
Here's a site that I really liked:
https://www.pianoeu.com/intro.html. The advice was golden for me, but it's difficult to read. The author doesn't know english very well, it took a while to get used to the language, and the site is disorganized. But once I figured out what he meant it helped me out. Even if this is no good to you right away, bookmark it, it may be useful for you later on.
Some will emphasize learning with improvisation, which I think is a good idea as well... So here are some improv sites:
https://www.improvise.nl/cursuseng.html,
https://pianomusings.blogspot.com/,
https://ericbarnhill.wordpress.com/Now for the books I have two recommendations:
Mastery by George Leonard, not to do with piano but with learning new skills, a small easy to read book, I haven't found a better description of good attitudes to take when learning new skills.
The Art of Piano Playing by Heinrich Neuhaus. Comprehensive. Author was a lifelong devoted teacher. Not the most organized book, but full of golden advice. I don't think it'll be too understandable for the complete beginner, but it's something you can pick up again and again as you progress.
Have fun!