You need to read for facts and details instead of fun and enjoyment. When I read textbooks in college I kept a running outline of what I read as I read. I wouldn't read for fun while classes were in...
Well actually, they are both pretty similar, except that reading on-line uses electricity. Reading a book, you have it in your hands, and you can also turn the pages.
Line, Shape, Space, Color, Texture, Composition, Light,Tint, Shade, Tone
Those are the basics. From the basics stem the more complex and detailed techniques. [Some examples are: shading, proportions,...