Before Adding to a collection. Things I suggest you should do. To grow your Collection and avoid repitition. Plus it will give you Fragrance knowledge.
The best way to identify scent categories and avoid replication is to group fragrances by how they actually smell, how they wear, and what role they serve in your collection, not just by the listed notes. A lot of newer people in the hobby look at note breakdowns and assume two fragrances are different because one has grapefruit and one has bergamot, or one has sandalwood and the other has cedar. But in reality, both fragrances can still fall into the same overall scent category and give off almost the same impression when worn. What helps most is learning to focus on the bigger picture. Instead of asking only what notes are listed, ask yourself what kind of fragrance it is overall. Is it a fresh citrus scent, a blue fragrance, a green aromatic, a woody scent, an amber spicy scent, a gourmand, a tobacco fragrance, an incense scent, or a leather fragrance? That matters more than the individual notes, because notes on paper do not always reflect how a fragrance actually comes across in real life. For newer enthusiasts, this is important because it is very easy to accidentally buy fragrances that all sit in the same lane. You may think you are building variety, but really, you are just buying small variations of the same type of scent. For example, you may own several fresh fragrances, but if all of them are clean, musky, citrus-woody, and worn in the same weather for the same casual daytime situations, then there is a good chance you are repeating yourself without realizing it. A good way to avoid that is to organize your fragrances into simple scent categories and then think about purpose. Ask yourself when you would wear it, what weather it fits best, what kind of mood it gives off, and whether it fills a different role from what you already own. Two fragrances do not have to smell identical to be redundant. If they create the same overall vibe, work in the same situations, and scratch the same itch, then they may overlap more than you think. Side-by-side testing is one of the best things you can do. Spray one fragrance on each arm and compare them directly instead of relying on memory. Memory can be misleading, especially when you are new to fragrance. When you test side by side, it becomes easier to notice whether one is truly different or just another version of something you already own. Sometimes the opening may seem different, but the drydown ends up being very similar, and that is where the overlap shows up. This can be done through samples or in-store.