Yes, how much you want to make though will define how much ‘work’ you have to put in to make as much as you want. You don’t have to sell a product or service online before you make money, but if you want to make money for a long time and consistently, you may have to sell either a product or a service.
If all you want is a little bit of money say less than $100 in a month, then you can do get-paid-to surveys etc, if you want more than that you can do ... more