Reasons of rejection of App from AppStrore

I am iOS Developer. I have seen and I had very bad experience with App store approval process.

We have developed app as per the Apple standards which are define of official site of Apple.

But I was rejected 2-3 times for different reasons

I just want to know that, why apple is not giving all reasons of rejections?

I also want to know App review process of Apple. If anyone know please help me..

Thank you in advance.