Good Deed

In the name of Allah, the Compassionate, the Merciful.

By (the Token of) Time (through the ages),

Verily Man is in loss,

Except such as have Faith, and do righteous deeds,

 and (join together) in the mutual teaching of Truth,

 and of Patience and Constancy.

(Quran chapter 103)

So basicaly you have to do good and strive to be good. Your good deads have to outnumber your sins. Allah forgives the sins but your good deads have to be more than your sins. In Islam, if you sin, your sin is recorded as one. But if you do a good dead Allah in his infinite mercy and love multiplies it by a minimum of ten. (He is helping us so that our good deads will be more than our sins).

�Allah, the exalted, has said: � Oh son of Adam, if you come to Me with an earthful of defaults and meet Me, not associating anything with Me (partners) , I would come to you with an earthful of forgiveness.� (Hadith Qudsi).

he has also said:

(God does not judge you according to your appearance and your wealth, but He looks at your hearts and looks into your deeds.)

he has also said:

(A man walking along a path felt very thirsty.  Reaching a well, he descended into it, drank his fill, and came up.  Then he saw a dog with its tongue hanging out, trying to lick up mud to quench its thirst.  The man said, �This dog is feeling the same thirst that I felt.�  So he went down into the well again, filled his shoe with water, and gave the dog a drink.  So, God thanked him and forgave his sins.}  The Prophet was asked, �Messenger of God, are we rewarded for kindness towards animals?�  He said: {There is a reward for kindness to every living animal or human.}

So basically we are rewaded on every good thing we do. Even a smile is an act of charity in Islam and whenever you do charity, your sins are forgiven. Any good thing you say is also a form of charity, so also your sins are forgiven.

Hope this answered your question.