To me, I don't really believe of luck existence. Well I might be wrong as everybody has his own opinion. But I believe sometimes life offers good and bad just the help of God to provide the good and overcome the bad. When the good is provided, it is sometimes called luck but when the bad overpowered someone's life, it is called disaster
Certainly it depends a lot on the opinion of each person, but it is definitely true that life offers you good and bad, the first is to enjoy and the second to make us stronger, the important thing is to accept that life comes with both and seek happiness in both.