Question - What's the best way to review and where should it be posted?

So a while back, I realized how important it was to give a review for a book. Not only for the author to help get the book noticed but also to the reader to help entice them on whether or not the book is worth their time.

Granted everybody has their own opinion and even though someone doesn't like the book, it doesn't mean it's a bad book.  It just wasn't right for that one person. I, myself, look at the cover first, look at the number of ratings, read the synopsis, look at the author's b...