It seems to me that every line of business has some preferred ways of advertising. For example, a local supermarket might use brochures or a pub with live music might distribute flyers to passers-by and that would work well. I recently tried creating flyers with my designs (this is my first time working with Illustrator, so I decided to use the free flyer mockup I found here https://www.ls.graphics/free-mockups/flyer-mockup as the template). It turned out to be not very difficult, although my flyer has the simplest design, but I realized that I can learn it. By the way, some areas of business are really better to advertise with the help of printed materials, for example, a menu in a restaurant or business cards.