Electronics, whether basic or advanced, is like any other subject. It is not a "concept". It is a study of a subset of physics pertaining to electrons with respect to their behavior and applications.
The study of electronics is built on a foundation of circuit analysis. A basic, yet complete, presentation of these basic principles can be found in "Circuit Analysis for Dummies". But be warned, every page covers a simple and important concept. If you are the type who can easily absorb the inter-relationship of concepts, then this book presents everything you need to know for the conceptual foundation of electronics. Attached photo is a portion of the book cover.