I am writing comments on the psalms as a personal discipline. I will share insights and observations here. They are not scholarly or filled with great wisdom. I recommend you read your Bible before you read my version. It's always best to go to the source.
Psalms1- Happy and Blessed
Psalms 2 Coronation of the Son of the King
The event is both earthly and heavenly. It identifies the "rulers who conspire together against the Lord and His Anointed One." Zion is the scene of the coronation and it is called, "My holy mountain." Those who resist are presumably humans who have no regard for God, but God ridicules them. He pronounces the Son as the recipient of the inheritance of the nations.
The instruction to the nations is severe: Serve the Lord with awe and rejoice with trembling. Do not provoke His anger that you perish. Take refuge in Him and be happy.
Psalms 3 prayer in time of trouble
Psalm 4 Prayer for Evening
Sometimes in Psalms David is speaking to the public, giving instruction, or naming the attributes of God. In verse 2 he questions those who perhaps are subjects: How long, exalted men, will my honor be insulted. Then he returns to his confidence in God's provision.
He recognizes the human tendency to experience anger and act in haste, but he cautions his subjects: be angry but don't sin; instead reflect in your heart and be still.
His advise to his subjects, or the people of his court, remains the same. Look to the Lord because He has put joy in the heart. David can sleep in peace and safety in the presence of God.