On any given hand, luck is 90%+. The hand you are dealt is luck. The hands your opponents get dealt is luck. You could get dealt AA, but if other players have nothing and they are not stupid, you are not gonna win must with AA. You might only take the blinds. But if they end up with AK, QQ+, you are probably gonna win a nice pot. And then the community cards will determine the action post flop.
The only thing you can control (the skill part) is the decision to fold, check/call, bet (and how much).
Over time, assuming the card dealing is legit (online, RNG legit), then skill begins to play a bigger role as luck should reflect your xEV based on the decisions you make.