1 1. Which tweezers should I buy?
Slanted Tip Tweezer - Good for holding fine hairs & gives maximum control.
Square Tip Tweezer - For removing coarse hairs or plucking several hairs at a time.
Pointed Tip Tweezer - Good for grasping small & fine hairs.

2 2. How do I know whether the tweezer is good or not?
When you are buying tweezers see that they are made of stainless steel. Look for proper length & grip that fits in your hand comfortably. See that the spring tension is soft enough, not to tire your fingers. See that the tips are sharp enough to grasp the hair.

2 3. How do I take care of my tweezers?
Clean the tip of the tweezers with an antiseptic or alcohol after every use.
Do not drop the tweezer or misuse it. This may damage the tip.
When the tweezer is not in use always protect the tip of the tweezer with a protective cap.