This lecture covers the basics of mobile robotics navigation, focusing on local and global strategies. It discusses obstacle avoidance techniques, including the use of sensors and potential fields. The instructor explains the differences between local navigation (tactical, sensor-based, and reactive) and global navigation (strategic, cognitive, and time-consuming). Various sensor technologies such as ultrasonic and laser range finders are explored in detail, along with their limitations and implementations. The lecture also delves into obstacle avoidance algorithms, path planning, and the challenges of combining attraction to a target with repulsion from obstacles.