When you study the Psalms, there are some main features to keep in mind. Psalms covers the entire range of human feelings and emotions. You will see David's fears, longings, doubts, hopes, joys, and sorrows. Psalms provides an inspiried book for worship. Worship consists of occupation with God himself and satisfaction with him.
Psalms provide much prophecy.
At least 16 Psalms prophecy of Christ. And Israel's past, present, and future are portrayed. It is not unusual for a Psalm to view the millenial reign of the Messiah and portray Israel at peace. Psalms tells us of the experience of the wicked. The Psalms is poetry - Hebrew poetry.