"luck" is is quite a few things IMO..
Being prepared to capitalize on an opportunity where the next man just lets it slip by. Having the belief in oneself that they will succeed at something that has no guarantee, and having the balls to go way out on a limb to go get something,and having the smarts to see something that most people don't see.
There is also just the element of chance, being in the right place at the right time, but ll those other things ave to be in place.
I'll give you a perfect example....
in the mid 90's. a very good friend of mine was working for our very, very wealthy friend who owned numerous car dealerships across Long Island, he supervised security on a couple of car lots.
The rich guy decides he wants to subcontract security for all of his lots, offsite storage and everything...like 25 locations. My friend asks for the contract, the rich guy half-jokingly says "fine, if you can have a uniformed , equipped crew ready to take over in two weeks time, you got the gig" . what he didn't know was my buddy has been saving his money for years,and had a crew ready to go in less than two weeks, he busted his ass 24/7 making that happen, and everyone called him a "lucky fuck" who had that "handed" to him