What are the sins and transgressions that a Muslim should avoid?

Sins are divided into major and minor. Among sins are: murder, theft, adultery, drinking alcohol, bearing false witness, and disobeying one's parents. No human being is free from falling into sin, and one must hasten to repent to Allah Almighty, for the Prophet, peace and blessings be upon him, said: "Every son of Adam commits sins, and the best of those who commit sins are those who repent." Allah has opened the door of repentance to His servants as a grace from Him.