The Algebra program from the Khan Academy will help you understand some of the topics pertaining to Algebra. Some of the topics are factoring expressions, linear inequalities, linear equations, linear functions, functions, ratios, quadratic expressions, and exponents.
The Algebra 2 program from Khan Academy builds upon the foundation of the Algebra 1 program. This covers imaginary and complex numbers, matrices, conic sections, and exponential and logarithmic functions.
This course provides a brief review of introductory algebra topics. Topics to be covered include integer operations, order of operations, perimeter and area, fractions and decimals, scientific notation, ratios and rates, conversions, percents, algebraic expressions, linear equations the Pythagorean theorem, and graphing. (Free to sign up)