I have learned that kore is 'this' so the first line is 'this is a book'. Kono is always used before the known item. So kono hon. Eg Kore wa Nan desu ka? - what is this? Kono hon wa Nan desu ka? - what is this book? Koko is 'here'. Think of them as: Kore, sore, are, as this, that, that over there. Koko, solo,asoko, as here, there and that place over there.