You basically go through life by trial and error, and even then change is constant, so what might have worked before is no guarantee of it being effective in the future.
This is what is referred to as "the Game" of life.
It is compared to a game because there are winners, losers, cheating, second chances, and no guarantees. We've all heard that "Life's not fair". We're all born into a system of survival and competition. Humans compete for resources, attention, and time. There are consequences to every decision, which can affect mild to severe outcomes. At the same time depending on your attitude, there is joy, happiness, and fulfillment. The key word is 'Attitude' because it will determine how one approaches life's twists and turns.