Linear Algebra
Foundations
Dot product, norms, and similarity
coreThe dot product measures alignment, norms measure size, and together they generate every distance and similarity you use — knowing when cosine beats Euclidean is a standing interview question.
10 minvectorssimilarityembeddingsdistancesMatrices transform space
introA matrix is a compact rule for transforming vectors — scaling, rotation, and reflection all become multiplication.
8 minlinear-algebra-basics