Useful Videos, Notes & Links
Video: The Map of Mathematics (by Domain of Science)
Video: Fibonacci Sequence & the Golden Ratio: Simple Explanation and Examples in Everyday Life
Algebra 1: Solving equations with square roots without introducing extraneous solutions
Geometry: Simplifying Polygon Problems Using Exterior Angles
Algebra 2: A YouTube Video on How to Draw an Ellipse
AMC 8: Counting Shapes with the Help of Labels
AMC 10 vs. AMC 12 How to Choose
A Collection of Typos and Errors of AoPS Textbooks and Webpages