The book of Psalms has 150 chapters. The last five (146 - 150) are all praises. Not very long chapters. Here is the Bible commentary on them collectively; all from the Life Application Bible:
"These last five psalms overflow with praise. Each begins with 'hallelujah' or 'praise God'. They show us why and how to praise God. What does praise do?
1) Praise takes our minds off our problems and shortcomings, and focuses them on God;
2) Praise takes us from individual meditation to corporate worship;
3) Praise causes us to consider and appreciate God's character;
4) Praise takes our perspective from the earthly to the heavenly."
I am including the first verse or two from each of those Psalms:
#146 - "Praise the Lord! Yes, really praise Him! I will praise Him as long as I live, yes, even with my dying breath."
#147 - "Hallelujah! Yes, praise the Lord! How good it is to sing praises! How delightful, how right!"
#148 - "Praise the Lord, O heavens! Praise Him from the skies!"
# 149 - "Hallelujah! Yes, praise the Lord! Sing Him a new song! Sing His praises, all His people."
#150 - "Hallelujah! Yes, praise the Lord! Praise Him in His Temple, and in the heavens He made with mighty power."