At a basic level, all of your cards CAN effect the outcome for you alone. For example, if you have a king and a 5, and there’s a five in the river then you have a pair. This is ranked last in the hands you can have that still can win. If nobody else has anything, you win.if someone else’s hand outrank yours, they win. If you tie, then I believe (don’t quote me) that it comes down to who has the higher non-pair card. You’ll want to have a reference for the hand rankings if you’re playing casually, or memorize them if you’re playing seriously. Does that help?