What might the "it" be that the preacher nailed yesterday and which preachers generally should aim to nail?
I suggest the "it" is the idea that there is a God who seeks relationship with people.
Nailing it means the preacher communicates that the idea has reality. There is a God, this God seeks relationship with people, in fact seeks relationship with each member of the congregation, and the truth of this reality is founded in the testimony of Scripture and given continuing expression in the testimony of God's people (including the testimony of the preacher).
At the heart of the gospel is encounter between God and humanity, the cross and resurrection being the work God has done in Christ to sweep away all obstacles to that encounter happening.
In our worship and preaching we seek (or should seek) to give expression to that encounter: celebrating what God has done, speaking about what God has done, praying about specific human difficulties based on the conviction that God wishes humanity well.
Whether our worship is simple or complex, short or long in time span, in Latin, Greek, Maori, English or other language, with orchestra or organ, it should have an identifiable and common centre: God in Christ has encountered humanity and continues to do so.
We should never leave a worship service without being renewed in both our conviction of and our gratitude for God's determination to meet with us!