When you refer to your position at the table, you should think about the place you have in the poker room relative to the player that is the dealer for that specific hand. If you are the dealer for this hand, you find yourself positioned last to bet, so your position is the best as you can see everyones reactions and bets before you make up your mind.
The player that has to bet the small blind is the player situated in the left of the dealer and after the pre-flop betting he or she will be the first to bet from now on.
The player that has to bet the big blind is the player situated in the right of the dealer and after the pre-flop betting he or she will have an early position. This position, as the small blind, is an obliged position, which means they cannot fold in the pre-flop
The player that has the position situated to the left go the big blind has the first action when cards are first dealt. Because the bets are placed in a clockwise motion, the ones that have to bet or decide later are the ones that are in late position and they are the one that have many advantages. They can think and see what everybody else is doing before acting and place bids...