I am a web designer and often my clients ask me these kind of questions:
What kind of site colors reflect my product?
If my target group is of low income, what kind of colors/shapes does my website need to have?
What font should I use if my product is considered luxurious?
If my client has a target group of 50+, what kind of font combination is better?
I am asking if there is a general guideline that will help me with these kind of critical questions or a place to start reading?