Introductory notes
Expository talk about extremal combinatorics (for non-experts)
Brief introduction to combinatorial games
Grad students seminar talk at UCI — Robustness of properties of graphs
Advanced topics
Lecure notes
Math 130B (my lecture notes from Spring 2020, the file contains a detailed review for Math 130A)
180A (my lecture notes from summer session 2 in 2020)