The two are more or less unrelated. If you could explain more precisely what is confusing you, that would be helpful. For example you mentioned "the question of chapter 3 based on strings and arrays". Telling us what the question is would be a good start. Then telling us what you think about it and why that leads you to make the post you just made, that would be helpful too.
The only cure for that is hours of television radiation. And this tiny ad: