Question

how can say, at the end of the the that you lesson was good

Answer 1

Explanation:

You can just say the lesson was really great or I learned a lot from the lesson,.......

Answer 2

You can start by thanking the audience/the group of people that were present. And based on the topic discussed make a point on any of it. Or say “I enjoyed this lesson/name of topic , thank you for explaining it talking about it “