The "... for dummies" series is quite good from my experience. What particular topic are you interested in? If you are learning math in school/college/universi

The "... for dummies" series is quite good from my experience. What particular topic are you interested in? If you are learning math in school/college/university, you should explore your library for alternative primers and textbooks. Despite they may cover the same content, authors heavily differ in the way of reasoning. Chances are high that you find your dream author in a suitably equipped library.