In Table Tennis, opponents alternate serves every two points during a match.
After every point.
In tennis, the player who won the point serves next.
The winners in tennis are the players who win matches and tournaments by outscoring their opponents.
In tennis, the player who serves first in a tiebreak is the one who did not serve in the previous game.
In tennis, the player who did not serve first in the tiebreak game serves first in the following game.
In tennis, the player who did not serve first in the first set serves first in the second set.
There are a number of online sources for videos of tennis serves. Some good places to look include YouTube, Active, Full Swing, Tennis Mindgame, and Optimum Tennis.
Tennis
In table tennis, each player is allowed two serves before the opponent gets a chance to serve.
In table tennis, each player gets two serves before the serve switches to the opponent.
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.
In a tennis match, the player who serves second in the second set is the player who did not serve first in the first set.