Making perfume notes involves layering scents to achieve a desired fragrance profile. Select a carrier oil like jojoba or fractionated coconut oil as a perfume base. Then, add essential or fragrance oils in three stages: base notes, middle notes, and top notes. Start with the base notes, which comprise about 20% of the blend, then middle notes at around 50%, and finish with top notes at approximately 30%. Adjust the ratios to fine-tune the scent, and allow the mixture to age for a few weeks to harmonise the notes harmoniously.