The definition of Display fonts is quite loose. Generally speaking, display fonts are made to grab attention by incorporating some more extravagant visual features (think something like Papyrus)
They are made for shorter texts that are often written in a bigger font. Again I talk about this in a very general way because it depends on the font and other factors. But usually this includes things like headings. So they would use slightly different proportions that wouldn't work that well at small sizes, but stand out more in bigger sizes compared to the "text" variant.
So in this case you would use Zed Text for all your larger text blocks and Zed Display for headings or maybe emphasized words. But to be honest, since they are pretty close visually, you can get away with using Zed Text for everything imho.
Apart from the licensing issues already mentioned by someone else: I don't know why anyone would use this service at that price. If you have the hardware and are tech savvy enough you can get similar if not better results using opensource tools and models. If you don't have the hardware you can still use paid services which should still be cheaper. And if you don't want to do anything with AI (which is the first thing you should think about when trying to accurately represent yourself to a future employer), you could still go to a local photo studio and get your picture taken by a professional at that price.
You can activate an OpenType feature to change the shape of the l to be more visually distinct from the uppercase I
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