This is a useful list of design myths. Here are a few relevant for presentation design (I adjusted the wording a bit here and there):

• Myth #34: Simple = minimal

• Myth #28: White space is wasted space

• Myth #19: You don't need the presentation content to design a presentation template

• Myth #14: You are like your audience

• Myth #13: Icons enhance slide clarity

• Myth #10: If your design is good, small details don't matter

• Myth #8: Stock photos improve the audience's understanding

• Myth #7: Graphics will make a slide element more visible

Photo by Alexander Schlembach on Unsplash