Precalculus
Coursera
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.
More resources on Logarithms
Art of Problem Solving: Logarithms
Advanced problems and wiki
Purplemath: Logarithms
Clear explanations with examples
Logarithms and Logarithmic Functions
Master logarithms & logarithmic functions with this free course by Sal Khan! Understand logs, solve equations, & explore their applications.
khanacademy.org
Khan Academy is a free online learning platform offering instructional videos, practice problems, and quizzes across math and other subjects, including comprehensive lessons on logarithms that cover properties, rules, and solving logarithmic equations.
Precalculus
Precalculus - A book resource
Algebra: Elementary to Advanced
Coursera course: Algebra: Elementary to Advanced - Polynomials and Roots