The phrase "to teach a lesson" means to help someone learn from their mistakes or actions by showing them the consequences or by giving them guidance or advice. Full definition
Teacher leaders were open and transparent about what worked, what was problematic, and other issues they encountered when teaching the lessons in their own classrooms. (mspkmd.net)
The experience taught him lessons about networking in science that have subsequently shaped his career. (science.sciencemag.org)
My professional experience includes creating lesson plans filled with play - based activities and then teaching these lessons on a daily basis. (jobhero.com)