As a visual creative, often so much of our "craft" is wrongly assumed as a intuitive knowledge, acquired through good luck and voodoo sacrifices. Truth is, more often than not, this knowledge is gained through practice and research. For myself, I've found it's always easier to master a concept if I can name it and understand it. Like a tasty bowl of Ramen, I find I can more fully appreciate the dish if I know all of the ingredients and where they come from. Only then Can I riff the individual parts into something new yet familiar. With that said, I've been trying to firm up my sense of composition by revisiting the ancient concept of "The Golden Ratio". This concept is a MUST READ for any designer, or any person who wants to understand the foundation of what makes something beautiful. This article by the people at Creative Bloq, goes in-depth with both exercises and examples for the seasoned vet and beginner.