khanacademy.org
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Khan Academy is a free online learning platform offering instructional videos, practice problems, and quizzes across math and other subjects. It includes a Functions unit with tutorials on function notation, graphs, operations, composition, and real-world applications.
More resources on Functions
Precalculus
Curso diseñado para facilitar la entrada del estudiante en los cursos de cálculo de primer semestre de prácticamente cualquier grado universitario, con especial énfasis en Ciencias e Ingeniería.
Precalculus: Mathematics for Calculus
Precalculus: Mathematics for Calculus - A book resource
mathsisfun.com
Mathsisfun.com is a beginner‑friendly math resource that provides clear, step‑by‑step lessons and practice across topics from arithmetic to algebra and beyond. It covers functions with definitions, graphing, composition, and inverse examples, plus worksheets and quick practice tools.
Algebra: Elementary to Advanced
Coursera course: Algebra: Elementary to Advanced - Polynomials and Roots
sosmath.com
SOS Math is a free math education site offering step-by-step tutorials, solved examples, and practice problems across topics like algebra, functions, calculus, and geometry. It also provides formula sheets and quick-reference materials to reinforce understanding and problem solving.
Functions and Graphs
Functions and Graphs - A book resource