Use sans serif type, such as Arial and Univers. Serif type, such as Garamond or Times New Roman, is much harder to read. Avoid type with thin strokes, because it reduces legibility. Use bold typeface for titles, headings, and captions to add weight. Text in upper and lower case letters is more readable than all capitals.
Some presenters still prefer to have the title in capital letters.
Put your most important point in your first sentence, not just in your conclusion. Keep your text in short and concise sentences, use descriptive phrases and bulleted lists, and add a few summary statements. Minimize text to no more than 40 percent of the poster. You can always put all the extra words in a handout. Do not forget the white space.