1. White SpaceLeave adequate breathing room. Cluttered designs are hard to read.2. Max 2 FontsBold for headings, light for body text creates elegant contrast.3. 350g+ PaperHeavier cards feel more professional and last longer.4. CMYK ColorsScreen colors (RGB) differ from print (CMYK). Design in CMYK mode.5. Standard SizeStick to 85×55mm — fits wallets perfectly.6. Matte or Gloss LaminationMatte: modern and elegant. Gloss: vibrant colors. Both protect against fingerprints.7. Information HierarchyName and title should stand out. Phone and email should be clearly readable.