Practical advice about how to explain complex material by visual means.
The Non-Designer's Design Book by Robin Williams
Call Number: 686.2252 W6754
Publication Date: 2014
Practical design advice, covering four basic principles as well as specific tips for various formats.
If you're designing a poster for a class, check with your teacher regarding expectations for poster design. They may be able to refer to you models or best practices for poster design in your subject area.
If you're designing a poster for a conference, read the sponsoring organization's guidelines and/or specifications carefully.