it depends on the game
some games have a skill component
other games like Poker are way more about skill than about luck
not all games will be 0% luck 100% skill / 100% luck 0% skill
some will be a mix like 80/20 or 60/40
Right in skill based games you can turn you luck into your side by playing skillfully and winning the game.I have seen players turning the whole game in Poker with normal cards against good pairs by their mindset so there are skill based games also.