Advantages of positive thinking:
1. Lower rates of stress.
2. Easy to achieve success.
3. Increased quality of life.
4. Increased life span.:))))
5. Easy to develop in many aspects(communication, skills, ...)
Disadvantage of negative thinking:
1. Can lead to stress, fatigue, depression...
2. Difficult to integrate.
3. Feel down.
4. Easy to feel insecure, anxious, not confident,...
5. Difficulty sleeping leads to easy illness.
p/s: I hope it makes you satisfied :))))