I don't think beginners luck is true in that beginners win more when they first start playing but I do think beginners will win more often in tricky situations (Think poker with someone bluffing really well but a noob not realising and calling an all in) because they don't play by in a predictable or standard way.
Gambling is not a matter of luck, beginner or professional, all have same chance to winning and losing. If there are any beginners who wins it is probably one of the attraction for many more in gambling. If you don't know gambling I recommend to never gamble. Save your money to investments, savings or buying bitcoin.
that's right no difference at all both beginners and pro has the same capabilities they both can win or lose the only matter is the timing when pro made a mistakes it is his fault but when beginners lose it is because he doesn't know what he's doing, we ll most of this thinking is just a psychological matters but it the real game its still luck will dictate for both players.