You change when the combined score of both opponents is an odd number. During a tie break, you change after both scores combine to 6 or multiples of 6.
There are 4 players on the court in a doubles match.
In tennis you must always start on the forehand (right hand) side.
Match point is played just like any other point in tennis, where the server must serve into the opposite service box on the receiver's side, but if the person with the match point wins the point, the match is over.
In the Olympics, the match is a best 4 of 7 games.
3, one person on one side of the net and two people on the opposite side.
Covering the court during a doubles match is very different from covering the court during a singles match. First, you have more tennis court to cover. Secondly, you have to figure out how to move around and cover the court with your doubles partner. The key is to move around the court together as a team. Maybe you play the ad (backhand) side. Your partner is pulled out wide for a forehand. You need to side shuffle along with them in their direciton because the center of the court needs to be covered. Your partner will probably hit a defensive shot. You will have to step in and recover your opponent
In tennis you hold it with your centre of your hand on the curved side of the grip
Only one bounce is allowed during any point during a tennis match. The player is allowed to hit the ball in the air without it bouncing once but if the ball bounces twice then the point is over and the point is awarded to the player that hit the ball that bounced more than once.
Numbers are used primarily as an aid to identification. An aid to identification is not required in a game of tennis as there is only ever a maximum of 2 players per side. The identity of these players is easily known at all times during the match by the officials and so numbers are not required.
The ad side of a tennis court is the players left side. Or the opponents right side.
Tennis played with two players on each side is called doubles tennis.
The same way it was selected on the indoor court - by spinning a racquet. The winner of the spin gets to choose the side or the winner can defer and let the other party choose the side.