Then after two weeks, go back to that chapter again. And you'll see there are few things that you remember, and there are few things that you don't. Over the time as you practice it, you'll manage to remember the important things that you wanted to. And the thing is that there is already so much of information on the Internet, in textbooks and whatnot. So as we try to learn new things, we forget what we have learned before, what we have learned earlier