What exactly is destiny?

Old saying: Destiny is determined by heaven, destiny is determined by oneself. It means that ‘fate’ is innate, but what about ‘luck’? It is the journey of a person's life. This sentence also explains that the only thing you can control is your luck, that is, how you will walk your own path, while your innate talents and conditions are unchangeable, and they merge into one to become your destiny. Can destiny be controlled by people? In fact, the answer is yes, but this answer is not complete. Because although we can control our own path, change our own mentality, and influence our own destiny and even the destiny of those around us, others can also influence you, that is, you can drift with the flow of destiny. In essence, we can't change anything, but we have indeed changed. What changes are just a few waves in the sea, fleeting. But don't lose confidence, we may not be able to change our destiny, but we can choose, choose what we like, choose what suits us, choose those things that are optional or not.