Responding to your assignment directive or question is the most important part of a student poster. Your response is the content.
The next important and challenging task is to make what you have written fit the space available on your poster.
A 10 page paper will not fit, or if it does, your audience will not be able to read it from a distance of four feet. Using short words and fewer of them saves valuable space.
Getting your point across briefly with fewer words is to write concisely. For posters, this means that the information must be immediately seen and understood.