One of the most popular ways is to use Photoshop. But if you don’t want to spend a lot of time learning the program, it’s better to use ready-made mockups. For example, here’s a very useful article on how to create a mockup using Photoshop
https://whatstrending.com/how-to-design-a-sweatshirt-mockup/. You can follow the step-by-step guide to properly format the image and add a logo to the sweatshirt. I also recommend using sites with ready-made mockups, for example, this site, where you can easily download and edit ready-made templates. This will save you time and effort. Good luck!