As I've seen there aren't really that many books out there for the aspiring artist that are actually of much help beyond the fundamentals. I'd like to find some myself. The internet is by far the best resource there is and I never find myself coveting a book that contains information that I can't already find online.
Ralph Meyer's book 'The Artist's Handbook of Materials and Techniques' is a very well known slab of a book, with lots of information about different processes and materials, but won't really teach you how to paint well.
Acrylic is a good starting point as you can figure out a lot of the theory quickly without waiting for paint to dry or thinking about too many rules like oil painting requires. The absolute most important thing you can learn first is subtractive colour theory and properties of the pigments. Without colour theory, you're screwed.
I realize this might not be of much help, but I feel like I've never had much help either. If I can't figure out how to make something work I end up looking for a specific solution.
There is lots of good stuff on youtube, Will Kemp's videos range from beginner to intermediate and some beyond, though many are only previews, you should be able to get some colour theory down from his channel :
https://www.youtube.com/user/willkempartschool . There's a couple of good videos that deal with pretty basic colour theory too.
Also seek out some of Paul Taggart's vids. He has whole complex landscapes from start to finish and has the whole thing in real time, as well as other videos dealing with materials and colour theory in acrylic, oil and watercolor.
Jin mentioned glazing and ala prima. I think think the most flexible approach is simple layering. Ala prima demands that you know what you are doing and have your knowledge of colour mixing at a pretty decent level. Layering in acrylic is fast and easy and allows for glazing on every layer with as little or as much medium as you please. You can also very easily make adjustments this way instead of getting it literally in one (ala prima literally = in one). Glazing itself is very useful, but some opaque pigments can give even bolder colours than glazing can. Some colours can't create bright saturated hues
without glazing. When you have built experience you will know which is which.
Art Van D'lay wrote:Smoalk. It. And. See.