Define "a lot." Understanding the plot of The Wind Waker is not contingent upon understanding the plot of Ocarina of Time. There's one reoccurring character and even then, The Wind Waker tells you enough about Ganondorf so that playing through Ocarina of Time isn't necessary, especially since Ocarina of Time didn't really tell players too, too much about Ganondorf in the first place. There are certainly connections between games, but the plots are more or less self-contained. For comparison's sake, watching Back to the Future Part III before the first 2 parts totally messes with the experience, even with the introductory recaps. Those movies are self-referential in a major way. Not so much with Zelda. I used to try to organize the series into a coherent timeline and there are a few that make sense. However, it's a mess quite frankly and even though a master timeline exists within the walls of Nintendo, it doesn't really affect the games too much.