PowerPoint will have zero learning curve, and you can do a surprisingly good deal with it beyond its actual function of presentation software. It also has built-in support for creating charts and graphs. FREE application with your LSC student Office 365. Poster templates for PowerPoint.
Google Slides is easy to learn and creative. Template or more templates.
Canva basics help you design your A++ poster. Templates and how-tos at https://www.canva.com/posters/
Get Office365 for free with your student email address: (myLoneStar username)@my.lonestar.edu
From portal.office.com, you can:
Use in the cloud
Download & install to your computer
Is the writing coach in?
Questions? Email UPtutor@LoneStar.edu