Summary of The Book of Psalms

Psalms is divided into five books : Psalms 1-41, which witness to David's life and faith; Psalms 42-72, a group of historical writings; Psalms 73-99, ritual psalms; Psalms 90-106, reflecting pre-captivity sentiment and history; and Psalms 107-150, dealing with the captivity and return to Jerusalem. These five books are often regarded as the devotional counterpart to the five books of Moses (Genesis, Exodus, Leviticus, Numbers, Deuteronomy).

Link: https://bible-history.com/old-testament/bookofpsalms