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.
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...
