1. The document discusses various algebraic expressions and operations, including: expressions, products, values of expressions, addition, subtraction, division, and multiplication of algebraic expressions. 2. Examples are provided to demonstrate each concept, such as factorizing expressions, evaluating expressions for given values, combining like terms in additions and subtractions, and performing long division and multiplication of polynomials. 3. The key algebraic concepts covered are expressions, operations, and factorizing expressions into their prime factors or irreducible polynomials.