NP-completeness and Branch & Bound
SAT
Job Assignment
Clique problem
Dominating Set
Vertex coloring
TSP

Here is a sample slide deck that you can use: https://docs.google.com/presentation/d/14szUEDtqIeRw_bF7TVFr6D1JDCXfFt_8rqTkHLQOENk/edit?usp=sharing as a starter.