I will interpret this question as asking which SIDE of the tennis court do you serve into first in tennis. The two halves of the tennis court are called "ad" (short for advantage) and "deuce." Your ad court is diagonal to your opponent's ad court and your deuce court is diagonal to your opponent's deuce court. You begin serving on your ad side diagonally into your opponent's ad side. If you are facing the net from the baseline, the ad side is the right and the deuce side is the left. In simpler terms, you start on the right side and serve diagonally into the left side of your opponent's court. This is a link to a tennis court diagram. Perhaps a visual will help better understand the answer to your question. It can be found on the related links.
When serving or returning, there is a deuce side and an ad side. The deuce side is on the right, the ad side is on the left.
deuce side..the left side is the ad side
the right is the deuce side and the left is called the ad side
If a player is standing on the baseline and looking at the net, the left side of the court is called the ad side.
The right hand side is the deuce side and left is the ad side.
The sides of the court are named according to the score. When the score is forty-forty, it's referred to as "deuce." When playing a deuce point, the server serves from the right side of the court. Thus, the right side of the court is considered the deuce side. When the score is ad-in or ad-out, the point is played from the left side of the court so that side is the ad side.
In tennis, you don't serve on just one side. The first serve of each game will be from the deuce side (the right side if you are standing on the baseline) and the ball will be hit cross-court to the other player's deuce side. The next serve will be from the ad side (the left if you are standing on the baseline) and go cross-court to the other player's ad side. This alternation will continue until the game is finished and a new one starts or the match is over.
Each player starts off on the deuce side (right side of the court) at the beginning of the game and alternates between deuce and ad (left side) every point, but every game always starts on the deuce side.
after you get deuce and the server wins the point. You call it 'ad in'
The serve should be made in the AD court.
ad = advantage