Determine your fragrance "theme".Find the scents that appeal to you, is it clean and fresh, green, fruity, floral, oriental, musky, spicy, elegant or mature. Then do a little research either online or at fragrance counters to find out what notes go into these fragrance themes.
Human often associate memories with scents, so get fragrances that speak to you and not because your friends say it is cool.
Fragrances tend to amplify in our tropical heat,so the scent can change throughout the day and in accordance to your body chemistry.
