a question about atonement

[cupotea]

I need instructions on:

What did Christ's atonement atone? Our original sin and actual sins? those
sins themselves, or the effects etc. of those sins?

Any good resources on this topics?

Thanks

 

[Irish Presbyterian]

Redemption Accomplished and Applied by John Murray
The Cross of Christ by John Stott
The Atonement: It's meaning and significance by Leon Morris
The Death of Christ by James Denney