Give Your Best
The simplest of all goals is simply that of doing one's best. Challenge your players to give everything they have. It is up to you, as the coach, to recognize what each player's best really is and to hold her accountable for delivering that, every time.
Outcome
Outcome-based goals could also be called long-term goals. They focus on results. An individual outcome goal might be to become a starting member of the team. A team goal may be to win the league championship. Outcome goals are the kinds most often set by coaches, but they are also the hardest to achieve.
Performance
Performance goals are achievable and lead to improved outcomes as well. They focus on the process by which you are going to become a better team. You could, for instance, set a goal of having all your players do strength training three times a week, or to increase the number of serves played for someone whose serve is weak. The point of these goals is to improve performance, but the goal itself focuses on the measures taken.
Skill-Based
Specific skill-based goals are especially appropriate for individual players. A player might set a personal goal of consistently serving in bounds, for instance. Encourage your players to set three to five attainable goals for themselves for the season.
Physical
A physical goal is similar to a skill-based goal. It might be to perform a drill in a faster time or to lift more weight. Help your players identify physical goals that will address their weaknesses and make them better players.
Social
Socially based goals may be necessary for players who have a hard time controlling their tempers or who can't seem to get along during practice. A social goal would be to avoid any angry outbursts for a month or to show a positive attitude even when not allowed to play. You can also include things like participation in setting up and taking down the nets or in recruiting of new players.