Playing tennis requires attention: standardized movements (e.g., fixing the wrist, hitting the ball sideways), adequate warm-up and protection (sunscreen, hydration, wearing protective gear), equipment selection (moderate weight, hard-soled tennis shoes), control of power and concentration on the ball, avoiding common mistakes (e.g., hitting the wall early, ignoring pace). (moderate weight, hard-soled tennis shoes), controlling power and focusing on the ball, and avoiding common mistakes (e.g. hitting the wall too early, ignoring the pace).

Detailed Notes
1. Movement standardization and basic skills
Grip and wrist fixation: Adopt the correct grip such as Eastern style, Continental style, etc., and make the wrist 90 degrees to the racket, so as to avoid the wrist loosening and causing injuries or deformation of the movement.

Side Strike: The shoulder is facing the net before hitting the ball, and the body is parallel to the flight path of the ball, so as to improve the accuracy of hitting the ball.

Move in a low crouching position: Keep the center of gravity down and legs slightly bent to facilitate quick adjustment of the stance.
Keeping an eye on the ball: Keeping an eye on the trajectory of the ball and moving ahead to the best position to hit the ball.

2. Warm-up and Sports Protection
Warm-up and stretching: focus on the lower limbs, waist, shoulder joints and wrists to reduce the risk of strain.

Sun protection and hydration: apply sunscreen 30 minutes before exercise and carry plenty of water to avoid heat stroke.
Protective gears and emergency treatment: wear knee/wrist protectors, carry Yunnan Baiyao aerosol to deal with sprains (red bottle sprayed first, white bottle after 3 minutes).
3. Points for equipment selection
Racket: Beginners choose a lightweight racket (265-285g for girls, 280-300g for boys) with a surface of 100 square inches. 
Tennis shoes: hard-soled professional shoes (such as Nike or Wilson), to avoid soft-soled shoes leading to broken feet.

Clothing: Comfortable and breathable, no need to pursue high-end brands.

4. Common mistakes and advanced suggestions
Avoid hitting the wall too early: when the beginner's movement is not finalized, hitting the wall will easily lead to deformation of the movement.
Control the priority of power: pursue stability and landing point first, then gradually increase the power.
Pace training: Tennis relies on footwork movement and requires specialized practice of crossover steps and slide steps.
5. Health and Frequency Management
Injury prevention: Play tennis with caution if you have old knee or waist injuries; stretch sufficiently after exercise.

Keep practicing regularly: at least once a week to avoid long interruptions that may affect the feel of the game.
Key summary: Tennis requires a balance between technical details and safety protection. Beginners are advised to establish a correct movement pattern under the guidance of a coach and gradually increase the intensity.