A poster is supposed to be an introduction to your research and ideas. A sample, if you will. Posters are meant to be read quickly, attendees don't stand there and read a long poster.
Putting your paper on a board is not a poster.
Posters and papers have different requirements. There is some overlap, but there are stark differences.
With this guide, you will learn how to make a visually appealing poster that people will be interested in reading.
You'll see that this guide is broken into 3 sections:
Each section will have videos as well as the main points discussed in those videos in adjacent text boxes.
You don't have to take my word for it, here are other great places to learn about posters.