Think of a product about which you have some significant knowledge, interest, or skill.
Number one piece of advice: if you plan on running your business long term, find a market that YOU have an interest and/or skill for. Otherwise, you will get burned out pretty quickly!
Hi @Edison1130 ,
I'd suggest you to read this updated blog post with ideas and hobbies https://www.shopify.com/blog/make-money-from-your-hobbies
Check the Shopify Youtube channel as well. It'd help you to understand what you really want and to experiment with.