luck
n. uncountablen. the things that happen to you by chance, rather than because of your own actions or skills. It can be good or bad, but people usually use it to mean success.
n. the success or failure apparently brought by chance rather than through one's own actions. Often used to describe a force that brings good fortune.
I had some good luck and found a parking spot right away.
The team won the game through a combination of hard work and a bit of pure luck.
While the entrepreneur attributed his success to a rigorous work ethic, he acknowledged that a stroke of luck regarding market timing played a significant role.
Typically uncountable; however, it can be used with 'a' in specific idiomatic phrases like 'a stroke of luck'.
I have a good luckI have good luckLuck is uncountable and does not take the indefinite article 'a' when used as a general concept.