Both Back -
Players are both back rallying / defending / attacking from the baseline .
Come to the Net -
One player approaches the net and uses the volleys to defend / rally / attack. Ultimatle players come into to build or finish the point or because they retrieveing a drop shot
Opponent Approaching the Net -
Opponent come to the net and you have to get the ball past them or over them or just make them pay another volley
Starting the point with a good first / second serve percentage and potentially aiming the serve or adding speed or spin to make to harder to return
Getting the serve back into play with depth or buidling off a weaker serves into space .