Putting a rice in a plastic container then heat it in a microwave will i have a cancer?

No, but: It would be better to use a glass container to cook the rice as plastic is likely to release chemicals on heating. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, low fat milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex.