But as I watched the games on youtube, it seems at the end it all matters how lucky a person is since the last game and winning cards depends on the last draw of the session. Math and Psychology helps but as I said, it is still decided by the last draw and how lucky the person is.
That’s only true for particular hands, and good poker players make money on the long term, in spite of having bad luck in some particular hands. All players have long streaks where they are lucky and others where they are unlucky. What good poker players do is to lose little when they have bad luck and to maximize their profits when cards favor them.
. You can definitely apply some maths in certain situations to help you gain some what of an edge. Especially in some table games, mainly poker, and some others too. 
