General "lesson":
* Leçon (f): This is the most common and general term for a lesson. It can be used for any type of lesson, in school or out of school.
* Cours (m): This translates to "course," and while it's more common for a series of lessons, it can also be used for a single lesson, especially in the context of a class.
Specific "lesson":
* Leçon de musique (f): Music lesson
* Leçon de français (f): French lesson
* Leçon de conduite (f): Driving lesson
"Lessons learned":
* Leçons apprises (f): This literally translates to "lessons learned."
So, you would say "the lessons" in French as:
* Les leçons (most general)
* Les cours (especially for a series of lessons)
You can also use the specific word "lesson" and modify it with the subject:
* Les leçons de musique (music lessons)
* Les leçons de français (French lessons)
Example:
* "I learned a lot of lessons in school."
* J'ai appris beaucoup de leçons à l'école.