The 6 Principles of Design
If there's anything being a designer has taught me, it's the fact that no matter the project, usage of these 6 Design Principles is a sure thing, even if you follow it strictly or not. No matter how much you deviate your design from the norm, it will always follow any of these principles.
The more you observe your designs, the more you'll see your usage of a combination of these design principles. It's universal!