This is a fine book on C64 Development. It starts easy and simple, with the basics on 6502 and some specifics of the platforms, and guides you through the creation of two games - one simple space shooter, and a platformer.
The tutorials are very easy to follow, up to a certain point midway through the Shooter, where you have to start using the given examples to do anything. It's still easy to do, but if you are trying to do the projects on your own, there's a bit more work to do.
Still, it's a great intro to the C64. It doesn't enter more advanced topics, but that fine, since it's a book about the basics, and it does that really well.