This lecture introduces matrix operations, focusing on addition and transposition. The instructor starts by explaining how to add matrices by summing corresponding elements. Then, the concept of scalar multiplication is discussed, followed by properties of matrix addition and scalar multiplication. The lecture also covers the definition of matrix transposition, where rows become columns and vice versa. The instructor illustrates the properties of transposition, such as symmetry and antisymmetry, and demonstrates how any matrix can be decomposed into a symmetric and antisymmetric part. Through examples, the audience learns how to verify the symmetry and antisymmetry of matrices and how the decomposition works for symmetric and antisymmetric matrices.