You will see New York used for:
Used for large titles, headers, and any text above 20 points. It features tighter letter-spacing (tracking) to look sharp and impactful at large scales.
Apple uses as its primary font for all keynote presentations. This is the same system font used on iPhones, Macs, and Apple Watches.
Presentation Design Principles: How Apple Deploys Typography what font does apple use in their keynote presentations
Since 2017, San Francisco has become Apple's universal typeface across all hardware, software, and marketing.
Introduced in 2015 to replace Helvetica Neue, is Apple's signature, custom-designed neo-grotesque sans-serif typeface. It was meticulously built from the ground up to solve a modern design dilemma: maintaining pristine legibility across everything from a tiny Apple Watch screen to a massive presentation projector. Why SF Pro Works on the Big Screen
Introduced in 2014 with the Apple Watch and later expanded, San Francisco replaced Helvetica Neue and Lucida Grande, creating a unified, highly legible typographic system. Why SF Pro is the Perfect Choice You will see New York used for: Used
The query correctly identifies a distinct visual style. The font used by Apple in keynotes is characterized by:
A condensed version of ITC Garamond. Used on the slides for the original Macintosh and early 90s keynotes. Motter Tektura
The font Apple used prior to 2014, which still provides a very similar, clean aesthetic. This is the same system font used on
Light text on dark backgrounds or dark text on white backgrounds.
Which part of the "Apple aesthetic" are you looking to master first? Fonts - Apple Developer