Here’s the river: AH QH 6H 10H KS
Here’s my hand: 3H 8D
Here’s my opponent’s hand: 4H 7S
I think we split the pot. My opponent thinks she won because the 4H beats the 3H in the flush.
Who’s right?
Thanks! 
The opponent’s right. A-Q-10-6-4 beats A-Q-10-6-3. Why would you think otherwise?
This is why a flush using four of the table cards is very risky when your completing card is low.
The rule being, that you compare every card in each person’s flush to determine the winner, not just the highest (or highest two, three, etc), per Bryan Ekers’s illustration. I.e., you both have Ace-high flushes, but “ace-high” is not descriptive enough - his ace-high flush was higher.
Huh… Thanks. I’m new to the game, obviously.
And why are you playing an 8-3 unsuited? I have to think there was very little betting pre-flop and post. But if either of you start in after the turn it’s pretty obvious who made what. But if you didn’t than there probably wasn’t much to split; probably the blinds, no? Of course who am I to talk after the horrible reads I made last night 
No worries - I think that’s the only “simple poker question” there is. Any other questions, you better start a new thread.