Being able to communicate information or tell a story visually is an essential skill in the 21st century.
Canva is a free, easy-to-use tool to do this.
Canva
https://www.canva.com/education/
Create and personalize lesson plans, infographics, posters, video, and more. 100% free for teachers and students at eligible schools.
Ready-to-teach Lessons:
https://www.canva.com/lessons/templates/
Below: Examples of posters.
Each is made up of a background color(mostly black), large type, medium/small type, and photos:
Tutorials:
https://www.canva.com/designschool/