"It smells nice" isn't going to help you shop for cologne. Learning the language of fragrance lets you communicate what you like, understand reviews, and make better purchasing decisions.
Scent Families
Fresh: Clean, citrusy, aquatic. Think laundry, ocean, lime. Woody: Cedar, sandalwood, vetiver. Think forests, campfire, pencil shavings. Oriental/Amber: Vanilla, tonka, amber. Think warmth, sweetness, coziness. Aromatic: Lavender, rosemary, sage. Think barbershop, herbs, Mediterranean. Gourmand: Toffee, chocolate, coffee. Think desserts and bakeries.
Performance Terms
Projection: How far the scent reaches from your body. Sillage: The scent trail you leave behind when walking. Longevity: How many hours the fragrance lasts. Skin scent: When the fragrance is only detectable from very close (arm's length or less).
Structure Terms
Top notes: What you smell first (0-30 minutes). Usually citrus or herbs. Heart/middle notes: The main character (30 min - 3 hours). Florals, spices, fruits. Base notes: What lingers longest (3+ hours). Woods, musks, vanilla.
Opinion Terms
Compliment-getter: A fragrance that regularly earns verbal praise. Beast mode: Extreme projection and longevity. Blind buy: Purchasing without testing first. Niche: Smaller, specialty perfume houses (vs designer/mainstream brands).