Here is a list of the important aspects to keep in mind in the early phase of the final table. As a big or mid stack you should raise/re-steal; as a short stack you should push all-in. Your cards - Pay attention to calling ranges. 78s is usually better than A3o, since it is less likely to be dominated.
The objective is to make the best possible five-card hand, using any combination of the player's two-hole cards and the five community cards. The game is divided into four rounds after which the player wins the pot.