Title: Gaussian Random Matrices, Orthogonal Polynomials, and Skew-Orthogonal Polynomials. Abstract: We will introduce the fundamental structures of Gaussian unitary ensemble (GUE), Gaussian orthogonal ensemble (GOE) and Gaussian symplectic ensemble (GSE). The GUE exhibits a determinantal structure, which is closely related to the theory of orthogonal polynomials, while the GOE and GSE have Pfaffian structures, connected to skew-orthogonal polynomials. We will also present some classical results such as Wigner semicircle law, and the Tracy-Widom law regarding the largest eigenvalues. — Renjie Feng