My local library has several online resources, such as Lynda (Linkedin Learning), TeenBookCloud, Hoopla, and others. Rather than creating a poster for a particular resource, I created a simple poster to access the library site.
I played with Canva and used one of their templates which was fun, but it was also limiting as you cannot modify the background.
Greater Victoria Public Library. Website https://www.gvpl.ca/
After reading the posters of others, I realized I was supposed to target a specific database. See below for poster that promotes using Linkedin Learning at the GVPL
Technology in the language learning classroom and library 