Start this lesson series here:
Understanding the Process of Salvation in Romans (Part 1)
Understanding the Process of Salvation in Romans (Part 2 - From faith to faith)
After Paul has introduced himself as a servant of Jesus Christ and an apostle, separated unto the gospel, he mentions something very important as he introduces the gospel of grace. Paul says the following,
Rom 1:16-17 For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek. (17) For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.
What does it mean that the righteousness of God is revealed from faith to faith, and that the just shall live by faith? This is something important and worth elaborating on before we dive deeper into the broader term of salvation.
I have already written a post on this topic, so I will point you to it for a fuller exposition.
See from faith to faith.