Share what you what when you want. Many people find it is a great tool for understanding what and how they think. Any journalizing you do is yours. The whole point is to help you better understand your own spirituality.
Some people find sharing helps.
If you do you don't have to share any of it. It is encouraged because it has helped others. It s based on the Ten Commandments. The goal is to expand your understanding and ability to apply them. The book makes the point that the 10 Commandments are universal, every religion in the world has them in one form or another.