What is the best way to have a soft and smooth skin??

Drink lots of water. Have a good diet with vitamins that are good for your skin. Moisturize your skin daily, morning and night. Protect your skin from harsh heat or cold weather. Avoid taking super hot showers, it will dry out your skin. Avoid products that contain SLS and aother things that will dry out your skin. Stress can also effect your skin. Do things that allow you to be less stressed.

Exfoliate, exfoliate, exfoliate! and make sure to use moisturizer to keep it hydrated and plump :D

Wash you face really well (with soap),don't eat have too not much sugar and occasionally have a facial (at home if you want) . :)

I use proactive and it really helps getting rid of acne and of corse gives you really soft skin.