Long-tail keywords are those that describe the content of your article, not just its title. For example, "how to lose weight" is a short-tail keyword because it only describes what's in the headline. But "7 ways to lose weight," while still pretty specific and probably not very helpful to most people looking for information on how to lose weight fast or easily. It would be considered long keywords since they go into more detail about one aspect of losing weight.
Long-tail keywords are important for content marketing because they are typically more specific. Therefore, therefore have a higher potential to rank in SERPs than general keywords. Additionally, keywords tend to attract less competition from other websites. And making it easier to rank high in SERPs for them. This makes them an important tool for businesses that want to drive traffic to their websites through organic engine results.