Color Theory For Designers

Color me unimpressed, but this is just another surface level analysis of very rudimentary ideas. I think it was in preschool where I learned ideas like "green is the color of leafs and grass", and "yellow is the color of the sun".

To say that a site looks professional because it employs a deep blue is fundamentally misleading, because all the examples they give are sites that would look just as professional with a red layout. Don't believe me? Try changing the hue of one of those screenshots. The composition of a design as a whole creates our impression of it, and I feel giving out reductionist and simplistic advice like SmashingMagazine so often does just makes things worse for people who were lost to begin with.