What important facts to know about print on demand before going on the business?

Selecting Profitable Niche: We go down to work without market research. The first thing to keep in mind when working with print on demand is niche or topic. The subject you are working on must be profitable.
Researching the product: After selecting the niche or topic, our job is to do research on the product based on the niche we have taken. At this stage you can visit the popular print on demand sites. E.g: TeeSpring, Printful, Printify.
Creating your own design: After selecting the niche and researching the product and seeing the top design, our job is to start designing for yourself. When creating your own design, you always have to keep an eye on the top designs in the market and research new ideas.