Sins are those acts that are forbidden in Islam by Allah in the Quran and by Prophet (SAW) in sunah. You will be punished for committing these sins.

But ALLAH MOST HIGH also says.

"Surely, Allah does not forgive associating anything with Him, and He forgives whatever is other than that to whomever He wills."

(Al-Nisa)

1. Associating anything with Allah
2. Murder
3. Practicing magic
4. Not Praying
5. Not paying Zakat
6. Not fasting on the Day of Ramadan without excuse
7. Not performing Haj, while being able to do so
8. Disrespect to parents
9. Abandoning relatives
10. Fornication and Adultery