What does 2 Corinthians chapter 1 verses 1-3 mean?

Answer 1

This is merely a typical "salutation" or "greeting" to a church that Paul uses in the beginning of most of his letters.

He identifies himself to the particular church... blesses them with the "Grace" of God: "May God our Father and the LORD Jesus Christ give you His Grace and Peace." (verse 2)

And verse 3 in this letter is a "reminder" to the church of the source of their blessings... and God's Mercies... before he delves into the meat, or purpose, of his message.