Hi kama'aina mama,
I feel like I'm following you all over the place recently.
Here's my opinion (and I never claim to know anything).
I believe the basis of the book is that Satan told God, Job only worships you because he has it so good. (paraphrased, of course). After God said to Satan, have you seen my servant, and how he worships me?
So God took things away from Job, one by one, because Satan kept saying, yes, you took this away, but he still has that. And they waited for Job to curse God.
Yes, Job didn't understand why he was losing everything. But he never lost his faith. He had all his friends and everyone he knew telling him to curse God and die. Still, he clung to his faith, even after losing his house, his exalted position in his town, his live stock, his wife, his children, everything.
No, he was never told why this happened. But, according t0 the Job 42:12-13 "So the Lord blessed the latter end of Job more than his beginning: for he had fourteen thousand sheep, and six thousand camels, and a thousand yoke of oxen, and a thousand she asses. He had also seven sons and three daughters."
I believe the lessons we can learn are: 1. Not everything that happens to us is going to make sense. I.e. bad things happen to good people. 2. We don't know why God does what He does, but He knows what He is doing. 3. All we can cling to sometimes is faith, as our friends and family may turn on us, or kick us when we are down. 4. For the things that we lose, we will get them back, in some way or form. 5. Life is always going to be a learning process, full of both sorrow and joy.
Hope this helps, a little, and enjoy your study.