People have said to read the Civilopedia. What is that?
The Civilopedia is a place that contains information for almost everything in the game, including attack/defense/move values and resource requirements for units, benefits and shield costs of wonders, information about every civilization and their Unique Units, and all the different kinds of terrain and their tile yields, to name a few. It is a resource that contains a lot of data about the things that makes up the game. To open the Civilopedia, click the book-type icon in the top right corner of your screen, or press F12.
