Canva
Canva is a free graphic design platform that's great for making posters, information sheets, Instagram posts, and more.You can sign up for free and get access to hundreds of free templates and free assets to either remodel a template or start from scratch. We have a short course that will guide you through the basics and then show you how to make a poster, finally there is an additional chapter which covers some extra features for those who want to learn more.
Access to the short course on Canva is located here and the homepage of the software is here.