If you are involved in designing products, services or experiences the easiest way to get better, quicker is to sharpen your critical thinking. This is remarkably simple in practice because it just involves asking yourself one of two questions: 

If you think something is good, what makes it good? 
If you think something is bad, what makes it bad? 

If you can get into the habit of thinking this way when you interact with products and services or when having an experience as a customer, every day becomes a learning experience and patterns will start to emerge. 

When patterns emerge they often reveal principles. Once the principles are clear you can systematically apply them, making your practice more efficient — achieving successful outcomes more consistently with fewer iterations and less risk.

See this post on LinkedIn