I want to earn some extra money, what is good to sell on internet?

On marketplace it is good to sell:

1. Lighters (you can buy them on AliBaba or AliExpres)
2. Sneakers (just check sales on websites good)
3. Money coins and banknotes (just check who is selling a collection for cheap and sell them one by one)
4. Pokemon cards (just check who is selling a collection for cheap and sell them one by one)
5. Second hand laptops (mostly you can find a wholesaler with cheap profitable prices)
6. Branded clothing (just check sales on websites good)
7. Tennis balls (people uses it for the dogs)
8. Parfum (just check sales good on webshops)
9. Laptop bags (just check sales good on webshops)
10. Posters (you can make them by yourself)