Canva: Free online image editor and poster creator
Lucid Chart & Lucid Press: In your Google Apps grid of tools
Apple Pages: On your computer. Lots of templates
https://piktochart.com/: A tool for creating infographics. May be handy for some of your awareness campaigns and graphics you are creating.
https://www.creativebloq.com/infographic/tools-2131971 has several other infographic online tools
https://www.designhill.com/design-blog/tips-for-a-creative-poster-design/
https://creativemarket.com/blog/how-to-design-a-stunning-brochure-30-expert-tips-and-templates
https://99designs.com/blog/marketing-advertising/brochure-design/
Talk about how you plan to or actually applied these design tips in annotations in your technical drawings and specifications or evaluation of your product.
Reference these in your Design Specifications, Annotations, etc. Use them in your analyzation, explanation and critiques of your poster and image designs you are creating.Put them into your appendix as research into how to create your product.
How did you apply them to your designs?
https://www.creativelive.com/blog/handy-guide-file-formats-designers-photographers/
It may be useful for explaining why you may have created images/posters in different file types (.jpg, .svg, .gif, etc...), depending on who or what your audience is for specific uses and areas of viewing (web page vs smart phone screen vs giant physical poster vs in the cinema vs display TV, etc.). Talk about in your Design Specifications, Brief, Technical Drawing annotations