Differences between PS/AI -
1. When to Use Adobe Illustrator vs. Photoshop vs. InDesign
1. When to Use Adobe Illustrator vs. Photoshop vs. InDesign
This post is breaking down the three pieces of design software from Adobe – InDesign, Illustrator and Photoshop and explaining when to use them.
http://www.printwand.com/blog/when-to-use-adobe-illustrator-vs-photoshop-vs-indesign
2. What's the Difference Between Photoshop and Illustrator?
https://www.pluralsight.com/blog/creative-professional/whats-difference-photoshop-illustrator
3. Nine Cool posters that show Differences between PS / AI
https://digitalsynopsis.com/design/illustrator-vs-photoshop-differences-minimalist-graphics/