Brilliant teaches math, science, and computer science through interactive lessons rather than videos. Each concept is introduced with a short explanation and then practiced through puzzles and problems that adjust to your level. Topics include algebra, geometry, calculus, statistics, physics, and programming fundamentals. The approach emphasizes thinking through problems rather than memorizing formulas.

Lessons are short enough to fit into a daily routine, and progress is tracked across courses. Some content is free, while the full library requires a subscription. It works well for learners who find passive video lectures ineffective and prefer to learn by doing. For developers who want to strengthen their math foundation or explore computer science concepts, it's a structured and engaging option.