the book of Job
As a loyal servant and really loved man by God. We see lessons of life that Job endured he had it all then the devil ask God to test him and he was granted permission Job wouldn’t budge at first until it got worse his kids were dead , he was ill. these trials made him mad and Question God, and God answered him and in the end Job repented and God forgave him and restored him and it was doubled beyond he’s expectation.
the book of Psalms
this book is the longest book in the bible , King David wrote most of it which varied in many different setting in his life , cry out to God , praising God , confessions to God, this book is full of insight and lessons to learn from.