The other portion of Fiverr is products to be sold for a clean $5. The items need to be delivered to the purchaser which will require you to be able to do so. Listings for products should be something which can be delivered to the customers after they have made their purchase.
You can provide physical products which would need to be shipped to the buyer once they have ordered from your Fiverr business. This can be anything from crafts, books, toys, cards, postcards, drawings, art to anything else you could think of as a product that is worth $5.
Digital items are also permitted to be sold on Fiverr. This will include things such as ebooks, reports, PDF formatted documents, mini-ebooks, software, etc. Basically anything that you own and can legally distribute via email or download link once a customer has made a purchase of the product is allowable. These types of digital items will usually need to be premade and can be given to the buyer within minutes of making a purchase.