You ask a very layered and complex question. We’ve touched on some of it in other threads like the ones below:
Indulgences: Are they still around today?
What actions did the church do to stop the selling of indulgences…
about confession and indulgence
You can also find more by searching the forums.
Priests most certainly do forgive sins.
Confession in the Bible
Penance and Reconciliation (Confession)
Dig through some of that first and then maybe we can help clarify any lingering questions you have! 
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