need help please with writing. I need to explain the purpose / main idea of the presentation. But I have no idea how to do that.

Answer 1

#1 -- What is the main idea of the presentation? What is the primary idea the presenter wants to convince the audience is correct? (Write only one sentence)

#2 -- What is one of the main reasons given to convince the audience that the main idea is true?

#3 -- What is another of the main reasons given ... ?

#4 -- What conclusion does the presenter give?

Once you can write those things down, you'll be able to write the main idea and an explanation of it.