These resources are for general guidance only. For specific requirements like font size, orientation and poster size you must follow the requirements you have been given by your lecturer - if you are not sure check the module handbook or on GCU Learn.
You may also want to check out Sage Research Methods - a package to support all aspects of research. There are lots of ways to create your poster - we have linked to PowerPoint guidance and Canva below - as always check the requirements you have been given.