What has this book taught you that could be applied outside DynamoDB? I'm close to buying but the price is kinda steep... if however I can take away some genera

What has this book taught you that could be applied outside DynamoDB? I'm close to buying but the price is kinda steep... if however I can take away some general NoSQL insight then I'm sold. Edit: nevermind, I see another review elsewhere and the author replying. Though, your opinion would still be appreciated! :)