Before you consider the formatting and construction issues associated with a scientific poster, it is important to hone your content in Word, Google Docs, or another familiar word processing format. Composing your poster as a poster will take longer -- so commit your words to the page in a more familiar format first.
When composing scientific poster content, keep the following sections of information in mind, as they'll be clearly separated on the poster as first-level headings. Check with your professor about their expectations about these major headings, too:
PowerPoint is the easiest way to create a UC-branded poster with minimal formatting work. You can use PowerPoint on a PC or a Mac, but switching between those two versions midway can result in the loss of some formatting fidelity.