Does luck even exist or is it the power of attraction? Is luck completely perspective based?

If someone says good luck, what do they really mean? That something difficult may be encountered and that said utterer hopes no difficulties impede your progress forward.

Correct?

When we say that was 'lucky' it is generally in regard to a 'near miss' or a sudden unexpected twist of fate seemingly in ones favor.

However what may seem lucky to some, may be seen as a curse to others.

The lottery curse for example.


So, what is luck?