Design Principles Poster presentations are about communication. There are many tools now available to allow you to do so, but it is easy to 'over design', thus defeating the purpose.
Simplicity is the best approach.
Posters are viewed at a distance. Therefore diagrams and text have to be simplified and selected details exaggerated. The key is to scale up the line-weight font size, to embolden text, lines and colours. By following a few guidelines you can maximise the effectiveness of your poster, while retaining control and self-expression.