My last answer was deleted for being pointless, but I had to add more letters for the correct, succinct answer to be published. The right answer is "a sentence".
I would say it’s about using your life usefully. In other words, the summary is about “Making use of one’s life”.
Hope it helps!
Answer:
talk about your book
Explanation:
talk about your book and why it's a good book but don't give away certain things like if someone dies do say they did and don't say how manly don't mention the bad stuff
A
hope this is real help :0