Good user interface design is rooted in some simple rules, and there are processes you can follow to design a great user interface. For example, imagine that you're building an app to capture travel expenses so that they can be claimed easily at a later time. The foremost thing we'll build over here is the screen that captures the details of a single claim. This is a perfect example of a modern form screen design.
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When designing a layout, it's a good idea to use a mockup tool such as Balsamiq (https://balsamiq.com/), or even paper and pencil to think about the layout of the screen. Physical index cards make excellent thinking spaces as they have similar proportions to a phone or tablet. Using paper, especially, helps you think about the arrangement of the screen instead of being distracted by the exact colors, fonts, and spacing that should be dealt with in a common set of theming rules.
To start designing the screen, we need to consider what data we'll need from the...