Many ways to draw, I'm sure. All go back to fundamentals for which there is no easy way, as with mathematics or anything else. www.deviantart.com/users/outgo…
Not easy doesn't have to mean no fun. LOL. If it were easy, we probably would lose interest in it very quickly.
BTW - with proper conceptual orientation, drawing in 3D can be learned in 5 days. See Betty Edwards, "The New Drawing on the Right Side of the Brain." Edwards, who is both an artist and Psychologist-researcher, now teaches her method to corporate clients. It is outlined in the book, which is interesting - if you are a brain researcher, as I used to be - but is full of much one need not know. Practice every day. It really boils down to that.
The best book for learning how to draw? Kimon Nicholaides, "The Natural Way to Draw." Like so many other good books on how to learn to draw, it's very helpful after one has already learned. LOL.
Drawing is the hardest skill of all the arts. Much harder than painting and sculpting. Both painting and Modelling clay are excellent adjuncts to drawing practice.