Besides the user's needs, what's another vital aspect of an app? Your first thought might be its design. That's important, correct, but before you can even think about the design, you need to get something else right: the data. Data should be the cornerstone of everything you create. Not only does it help you to make more informed decisions, but it also makes it easier to account for edge cases, or things you might not have thought of otherwise. If you want to get even more out of Sketch, feel free to check out our fancy new book, âThe Sketch Handbookâ, with practical examples that you can follow along, step-by-step, to master even the trickiest, advanced facets and become a true master of Sketch.