“What things do I need to see my bishop about to be forgiven?” New Era, Nov. 2008, 23
The short answer is that you need to confess “serious transgressions” to your bishop. These include (but are not limited to) serious violations of the law of chastity and acts of violence or dishonesty that cause serious harm or damage to others.
The long answer is that if you feel like you should talk to your bishop, do it. While the Lord is the only person who can ultimately forgive your sins, priesthood leaders play an important role in your repentance.
You might think that a bishop is there to deal with you only when you’ve done something seriously wrong, but a bishop is also there to counsel and help you in other matters. So even if you haven’t committed a major transgression, or if you just need someone to talk to, you can go to your bishop. He can help you.