Where do people find their mods for Honda Civics?

I'm helping my friend out because they're new to cars and i personally have a Mustang so i get all my parts from AM or LMR and i went to go help my friend look through website but i can't find any. It appears that anytime i try to look for parts just by the google search bar the most common thing that pops up is either ebay or amazon. I'm trying to get legit parts from professionals who know what they're doing i.e American Muscle for Mustangs. If anyone knows any website for civics please let me know. Thanks in advance!

Added (1). Looking for both performance and cosmetics although mostly interested in performance

First question is: What are your goals with the mods? Are these going to be cosmetic mods, or performance mods?

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