You will find much more various things and will find much more easy to learn the things you want to know if do a search in internet and find such stuffs about economics. There are to much. A single book normally is product or follower of only one schools of economics. But are to many. You will find all those only in internet. The same like be in several books. Explained in the needed way by the people which are followers or developers of these. While one book give normally as good thoughts only those of the school that the author of book follow and will find critics about all the other school of thoughts. So if take knowledge from internet you will be able to see everything else out of that only book (whatever can be) with your eyes and with your mind and not with that of the author of the book (whatever can be). Or better even with the eyes and the mind of every author. And will be (can be) you yourself to like or choose what seems more convincent. Wikipedia for example is a good source. But it is only one and (with much probability) might not be enough.

Then don't forget: a book is hard to be understand. It is not so in internet.