What is what does hindsight is 2020 mean?

The phrase "hindsight is 2020" means that sometimes it is easier to understand or make sense of events or choices after they have already happened (hindsight) than it is in the moment. In this context, the term "2020" is referencing the year with perfect vision, suggesting that it is easier to see and understand things clearly with the benefit of hindsight. The phrase is often used to reflect on past decisions or actions and to acknowledge that hindsight can provide a clearer perspective.