How can I have my sins absolved? Do I have to confess my sins to a priest and then do penance in order to be forgiven by God? Is a time period of cleansing in purgatory necessary after death?

Is penance mentioned in the Bible? - https://www.gotquestions.org/penance-Bible.html

What does the Bible say about confession of sin to a priest? - https://www.gotquestions.org/confession-sin-priest.html

IIs the Catholic concept of absolution biblical? - https://www.gotquestions.org/Catholic-absolution.html

What does the Bible say about purgatory? - https://www.gotquestions.org/purgatory.html