The 80/20 rule to write headlines, inspired by the Pareto Principle, suggests that 80% of the outcomes (in this case, the success of content in attracting readers) comes from 20% of the causes (the headlines). In content marketing and copywriting, this rule emphasizes the importance of spending a significant amount of time and effort on crafting compelling headlines.
The idea is that while the content itself is crucial, the headline plays a disproportionately large role in attracting attention, driving traffic and encouraging engagement.