Confused: How to read winning hand?

Who wins the hand?
Player one has 3, 3.
Player two has A, K.
The river show's 8,8,5,5,7

Because I've just played online and I won with a two pair. Which I don't see fair. I'm guessing because I had high card (I was player two). But can cards on the river really be your winning hand? Even if you don't have them in your pocket hand.

Also if I have 3, 7 and on the river it shows 7, 7, 10, 10, 5 do I have a full house? If so i find this unfair

jmorgan said:

Who wins the hand?
Player one has 3, 3.
Player two has A, K.
The river show's 8,8,5,5,7

Because I've just played online and I won with a two pair. Which I don't see fair. I'm guessing because I had high card (I was player two). But can cards on the river really be your winning hand? Even if you don't have them in your pocket hand.

Also if I have 3, 7 and on the river it shows 7, 7, 10, 10, 5 do I have a full house? If so i find this unfair

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You should go to the learning poker forum with these questions.

But, it is the BEST FIVE card hand.

33 on a flop of 8-8-5 has TWO pair. 8's and 3's. When the 5 hits the turn, he now has 5's and 8s. He got counterfeited. Now you have 8s and 5s with a 3 kicker.

Player 2 would have 8s and 5s with an ACE kicker and the better hand. If a 3 fell on the river, you would have 3s full of 8s.

And the second hand, yes you would have a full house. 7s full of 10s. Remember, best FIVE card hand.

5 best cards win using either all 5 from community, or 4 from community and one from your hand which is the case above or using both of your cards with the best matching 3 in community