Basics of User Experience Design
Start webdesign by selecting the most likely platform for your app/site, and create a design for that first. Find the lowest resolution with more than 3% market share on the said platform. Find the minimum viewport size in that case. The most commonly used web safe area is 980×500px.
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If you are looking for the most pleasing proportion between two things you should start with the golden ration (they can be anything from paddings on websites to proportions of buildings). In UX design we can live with the rough estimate of 1.618 for this irrational number.
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