[English Writing Exercise] 1: A review about a Greek Mythology book

I wrote a review about Greek Mythology: A Concise Guide to Ancient Gods, Heroes, Beliefs and Myths of Greek Mythology. I'll appreciate all advice or rectification. By the way if you get interested in Hourly History from this review, it couldn't be better. Here it is:

After recommending DK books before, I discovered a new and awesome brand again: Hourly History. The other day, in order to read a book, written in Chinese, about astrology, constellations and the corresponding English etymology, I familiarized myself with Greek mythology at first. But there are many more books than I thought, including illustrated books and even academic works. I had considered DK books, but the form of Greek mythology is mainly textual, rendering illustrations joyous but unnecessary and time-consuming. And I have no plans to become an expert in Greek mythology. So I searched "concise Greek mythology" on Amazon and eventually fount out this book brand.

As the name "Hourly History" suggests, you can pick up any subject that interests you in less than one hour. The brand has published 288 books so far, involving Hilter, the Cold War, Celtic Mythology, and so forth. Because the books are highly concise, all of them are made into ebooks directly. According to my investivation on Amazon, the brand focuses on biographies of famous people mainly, and it is a stroke of luck that almost all these books are Kindle Unlimited! Therefore, this brand is fully suitable for ESL learners, like me, who won't to spend a lot of time and money on those expensive and thick books.

As for this book, it took me two or three hours to finish it, proving that I still have a long way to go in terms of improving my reading skills! However, its required vocabulary is not higher than I thought, and an ESL learner who has a vocabulary of around 7000 words can get through this book with ease. What makes it imperfect is that it does not introduce the story of non-main roles like Medusa and Heracles. Nevertheless, it is enough to cover Greek mythology overall.