If anyone may reply...sin is anything that displeases God.

The unforgivable sin is rejection of God's uniquely born Son, Jesus Christ.

All sin known and unknown to the person is forgiven at the moment of belief in Jesus Christ...faith alone in Christ alone. After salvation, the believer is to learn about God and what pleases Him and how He has provided a way for believers to name thier sins to God for forgiveness at which time he forgives known and unknown sins. IJohn1.9
.....there is also rbthieme.org that has more information if you seek truth.