In the final lesson on energy resources, the focus is on energy efficiency, emphasizing its importance due to the increasing energy consumption, especially in developed countries. Energy efficiency means minimizing waste, applicable in homes, industries, and transportation, with examples like unplugging appliances rather than just using standby mode. To promote efficiency, choosing appliances with high energy ratings like A+++ and adopting habits like walking, cycling, using public transport, or carpooling are encouraged to reduce overall energy use and costs.