For those seeking resources to understand algebra, pre-calculus, and trigonometry, several recommendations emerged in the discussion. While "Topics in Algebra" by I. N. Herstein was suggested, it received criticism for being too advanced for beginners. Instead, "Basic Mathematics" by Serge Lang and books by I. M. Gelfand, specifically "Algebra" and "Trigonometry," are recommended as suitable alternatives. For a more accessible introduction, "Algebra the Easy Way," "Trigonometry the Easy Way," and "Calculus the Easy Way" by Douglas Downing are suggested, as they present concepts in a narrative format. Once foundational knowledge is established, users can explore more comprehensive texts like "What is Mathematics," "Calculus Made Easy" by Silvanus Thompson, and the "Princeton Companion to Mathematics." For those preparing for AP exams, "Thomas Calculus" or "James Stewart Calculus" are also recommended.