As i say before I'm not very good at chess. So I check out some chess book. But I'm not the kind of people that memorized all the opening in chess book. Some people thought memorized all the opening will be helpful but it not true. If you just follow the move in the chess book someone might used a different tatic that can destroy you. You follow the moves in the book and you thought that your going to win because you follow the moves in the book. But that wrong because the moves in the book is just for that situation but not every situation. But not all the book are focas on opening. I think the best way to learn is to study puzzle.