I really appreciate the effort in this post, though the lack of facility with the language makes it impossible to understand in places. Skip the overview. Start reading at the section titled "What is a neural network?" It might still leave you confused, but I find that the effort the author takes to make things clear outweighs the difficulty his use of language might otherwise cause. Even more to the point, this is a really good example of someone learning by sharing what he has learned by writing it out as clearly as possibe. It's a practice to be emulated!