The best courses for "branch of mathematics", abstract algebra.

Maths for Humans: Inverse Relations and Power Laws

by UNSW Sydney

Introduction to Galois Theory

Pre-Calculus: Functions

Introduction à la théorie de Galois

Linear Algebra - Foundations to Frontiers

by The University of Texas at Austin

Calculus 1C: Coordinate Systems & Infinite Series

by Massachusetts Institute of Technology

Watch the Online Video Course Learning Algebra: Pre-Algebra

by Lynda.com

Algebra Trigonometry: Equations and Inequalities

by Great IT Courses

Jacobi modular forms: 30 ans après

Math - How to Factor

by Chris Wingard

Number Theory and The Secrets of Numbers

by Kody Amour

Learn Algebra, from Beginner to Advanced equations

by Jana Checkley

Real Numbers

by Joe Huston

Topics in Algebra: Polynomials and Factoring

Linear Algebra and The Study of Spaces

Scilab for beginners

by Fabienne Chaplais

Algebra Lineal. Matrices y teoría de Espacios Vectoriales

by Jose Barreto

Learn Algebra The Easy Way!

by Julio Gonzalez