I prefer to combine the approaches. Read blogs to get a general sense of what's worth studying more deeply. Then study it more deeply with a textbook or MOOC. T

I prefer to combine the approaches. Read blogs to get a general sense of what's worth studying more deeply. Then study it more deeply with a textbook or MOOC. Then read blogs and watch videos to help clarify the concepts that you didn't quite grasp. Usually your understanding will be solid enough by that point that you'll be able to judge the quality of the material pretty well.