My general strategy is to write about books that I happen to be reading anyway. I'm finding that it's a great way to deepen my knowledge retention of the books that I read. It took me about 5 to 7 hours to synthesize the contents of the book into these main themes. If you read the book you'll find that it's organized very differently from the themes that I've identified.
So, sorry if it's coming off as garbage affiliate content just created for the sake of sales. Definitely not my intention.