Since you mention the KTN rules, I assume you have some cursory knowledge of electronics. However, there are books that start at this level and then build such as AoE and it's lab book. I have no way of knowing whether you are strictly interested in theory or you just want to dabble and create some basic electronic circuits and tinker with them.
The basics only change if there are fundamental reasons for changing and old books (40 years old) and new books have the same basic info. Search online for fundamentals of electronics and you will get tons of info. By adding the search term "books", you will find many books.
Forest Mims III books on basic electronics. He has written many books on the subject and many articles. A search will find a multitude. His style is easy and straightforward.
Encyclopedia of Electronic Components, Volumes 1, 2 and 3. These books describe basic electronic components with a very cursory suggestion as to how/where to use them,
Understanding Basic Electronics by Walter Banzhaf is a very cursory view of electronics and covers very elementary concepts.
Grob's Basic Electronics is a book for someone who is interested in becoming a technician. The goal is to show the student fundamentals in the the perspective of a technician.
Video series: Kahn Academy
https://www.khanacademy.org/science/ap-physics-1/ap-circuits-topic/current-ap/v/circuits-part-1CodeNMore: This series is VERY basic and will get more complex as the series ends.
MIT OpenCourseWare 6.002, Circuits and Electronics. This is a series of videos covering basic engineering electronics (a lot of math).
As you can see, I have done a few searches on the web and found these in just a few minutes; you can do the same.
Hope this helps...