I like the Ansel Adams trilogy too, but I would probably save that for my second bit of study, after reading a basic photography textbook. It is very specific, and provides a whole lot of good-to-know, but unneeded information right off the bat. "Photography" by London and Upton (or Upton and Upton in some earlier editions; I believe the two authors were formerly married), or "Black and White Photography" by Henry Horenstein (now a professor at RISD) are two classroom standards. Both should be available cheap on the used market, and found easily on Amazon dot com, or maybe even in your local used book shop.
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As for being overwhelmed, that is totally normal. My advice is to not let the technical minutia of photography distract you from what really matters most: concepts and composition. Technical stuff can be learned by anybody in time; at least the bare minimum needed to bend the tools roughly to your desires will come to anybody via enough practice and study. The other stuff is difficult, if not impossible to teach, and all the technical stuff is simply a means to these ends.
Photography, like musical performance, is very forgiving in that once you have grasped a few of the very basic technical principles, you have already learned 90 percent of the stuff you need to know to completely manipulate your pictures on a technical level. Technique is simply learning how to manipulate your tools in order to get the non-tangible content that you want. That desired content should always come first, and the techniques should simply be used to build the path to it. Do that in reverse, and you have 90 percent of the crap that is out there.
There is a lot of technical talk here, because it is hard to talk about content in an Internet forum. I come here mostly for technical reasons (to "talk shop"), but it is a good place people at all levels of technical involvement with the hobby.