KISS: “Keep it simple, Stupid” is a design principle noted by Skunk works in 1960's. The KISS principle states that most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided. This article does good job describing its application to UI design. https://www.interaction-design.org/literature/article/kiss-keep-it-simple-stupid-a-design-principle