I went looking for a book to help me care for my new bonsai as soon as I realised I had no idea what I was doing!! I bought this book and also "Bonsai Basics" as both seemed pretty good. "Bonsai: 101 Essential Tips" briefly covers just about everything you need to know as a beginner, from where to keep your bonsai to how and what to feed it. And also, once you get more confident, it also goes into detail about wireing and repotting your tree.
If you like to have a basic guide on what to do, and catch on quickly, this is the book for you. If however you don't trust yourself to get it right straight away (like me) and prefer to have as much information as possible, then "Bonsai Basics" is probably a better choice.