The skill, so your skills or your abilities are in contrast to the luck of the game of poker. The greater your skill, the less your success in poker depends on luck.
A player without a skill can achieve some success in the short term, but then this is a lucky coincidence for this player, as he does not use his skills purposefully to play consciously profitable poker.
The skill of a poker player basically means many skills that are essential to be able to beat the game in the long term. These include, among other things, the correct selection of starting hands, good table selection, adequate bankroll management, but also the mindset and the tiltresistance of a player.