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.
For beginners, I suggest that you choose commoditized products and niche products since they are easy to sell and have a lot of potential for creating profit.
After having some products in your mind, you could choose one or two of them via these questions:
If your chosen products met these criteria then you could begin to sell them right now.