It should come as no surprise that the education topic is chock-full of great material. Given the range of items it covers, you will see why it is the third most popular topic on this site.
The two largest topics you’ll find within education are your “how to” books and those that bust myths and misconceptions. These two categories assist you greatly in your long path of autodidacticism (self-directed learning). Both the “how to” and the myths and misconceptions books cover a wide range of interests, helping you educate yourself (and others) in pretty much every other topic on this site. Case studies are also well represented and learning from them is a good way to help bring clarity to a subject.
However, in addition to books that educate, a large number of books discuss the education system itself, such as higher education and college alternatives, or the public school system and public school alternatives (whether it be homeschooling, Montessori, a Sudbury School approach, or other forms of unschooling).
For those homeschooling or otherwise teaching young ones, resources exist on reading (including debates between whole-word / look-say and phonics), and for the older student and certainly for the self-directed learners out there, you will find resources on the trivium method that provides a systematic approach (of grammar, logic and rhetoric) to learning any subject effectively, and you will find plenty of study guides on a variety of subjects.
As a self-directed learner, a fan of busting myths and as a father I feel that this is one of the most crucial set of topics. These lay the foundation upon which everything else can be built. I hope you find as much use in these books as I have. And as always, thank you for reading!