Guy Kawasaki's 10-20-30 rule advises presentations to have 10 slides, last 20 minutes, with 30-point font for clarity and engagement. However, evolving technology and audience expectations may challenge its relevance today. The rule promotes focus and readability, though complex topics might need more slides. Adapting the rule to suit various contexts, using visuals, and optimizing delivery are essential for effective modern presentations.
https://designshack.net/articles/business-articles/10-20-30-rule/