Albert Barnes on Acts 20:2

Over those parts. The parts of country in and near Macedonia. He probably went to Macedonia by Troas, where he expected to find Titus, 2Cor 2:12; but not finding him there, he went by himself to Philippi, Thessalonica, etc., and then returned to Greece Proper.

Into Greece. Into Greece Proper, of which Athens was the capital. While in Macedonia, he had great anxiety and trouble, but was at length comforted by the coming of Titus, who brought him intelligence of the liberal disposition of the churches of Greece in regard to the collection for the poor saints at Jerusalem, 2Cor 7:5-7. It is probable that the Second Epistle to the Corinthians was written during this time in Macedonia, and sent to them by Titus. See Note of Doddridge.

(c) "exhortation" 1Thes 2:3,11