As shown in the poker hand rankings chart, the order of poker rankings (from the highest to the lowest) is: Royal Flush, Straight Flush, Four-of-a-Kind, Full House, Flush, Straight, Three-of-a-Kind, Two Pair, One Pair, High Card.
Positions at the table are split into three parts: Early positions: The two blinds and the player sitting at the Big Blind's left. Middle positions: The next couple / tree seats at the table. Late positions: The Button and the two players sitting at the button's right (the cutoff and the hijack, respectively).