Posters are a time honored way of getting your message across to people. A big part of the reason what that is the case has to do with the fact that people often see these posters at some point while they are out walking and the like, and this leads them to want to figure out how they can engage in whatever the poster was telling them about. Hence, you should definitely consider using some kind of a poster if you have any product or service that you are attempting to promote at any given point in time.
That said, it is important to note that poster design matters too. You can’t just put up a poster and expect it to magically work. Rather, you might want to optimize the design so that you create a truly great poster. The people over at cartazes have a lot of tips that you can follow, and one tip that you need to act on is that the typography should be bold. Ideally the poster should be visible from a distance and anyone that is far off should ideally be able to read whatever the poster says or at the very least gain a basic understanding of what it is asking them to do.
Not choosing the right font would mean that your poster just wouldn’t be able to do what you need it to. It is a common mistake that people make to choose a font that looks nice but is not bold enough to be read from a distance. You should avoid making this mistake since it would make it difficult for you to get your message across through the use of a poster.