What online business is easy to set up? 

If you're just a beginner, I recommend you try affiliate marketing (the easiest way to earn money online)
.
It is an online sales tactic that allows the owner of a product to increase sales by allowing other people who go to the same audience ("affiliates") to earn a commission by recommending the product to others. At the same time, it makes it possible for affiliates to earn money on product sales without creating their own products.

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https://www.thebestntop.com/2019/12/what-online-business-is-easy-to-set-up.html