"To apply those lessons" means using the knowledge or skills you have learned from a certain experience or situation in a practical way, usually to make improvements or avoid mistakes in similar future situations. Full definition
By incorporating the latest advancements in building design and technology — and by applying lessons learned from prior disasters — we can create safer, stronger, more resilient communities. (fema.gov)
My full schedule of classes included two - dimensional design, a course applying lessons from art history to studio practice, a survey of art history, and figure drawing. (paintersonpaintings.com)
The result was a book of four - page chapters that each include a birth story, a lesson, and guidance on applying the lesson in daily life. (fourthtrimesterpodcast.com)