when i first got interested in growing cannabis, i read tons of books on the subject, but that was also in a time when the internet was not what it is today..
if you're just starting out, i'd suggest joining a few canna related forums, finding the people who have been there for some time and have a few online grows that you can follow and see for yourself if they know what they're talking about or if they're full of bs.. find these people and follow their grow journals, see how they approach things and how they handle obstacles they might come across during a grow..
don't just follow anyone one person, and don't take anything as gospel, no matter how experienced the person saying w/e it is may be..