This document defines teaching skills and lists some core teaching skills according to B.K. Passi. It includes skills such as introducing a lesson, using stimulus variation, explaining, illustrating with examples, using a blackboard, asking questions, and reinforcing students. Each skill is broken down into its components and desirable versus undesirable behaviors. The document also lists additional skills that are important for biology teachers, such as enthusiasm, problem solving abilities, understanding science concepts, and demonstrating safety procedures.