Great article in the Sept. 2017 Consumer Reports magazine titled "How to Cash In on Cash-Back Credit Cards."

I do not personally have one of these, but have friends that use them for the rewards. This article explains how they work and gives details on which cards would be right for you, e.g., large family, or retired couple, or single professional, etc.

Also, the same issue contains other articles on prescription medications, the new solar roofing material, and the best time of year to get the best deals on appliances and televisions. That's along with their usual review of certain car categories.
I'm a subscriber, but you'll get a big bang for the buck for this issue.