The Church recently posted a detailed explanation of Church discipline. It is informative and helpful, especially in light of the recent highlighting in the media of two members who are involved in disciplinary councils. You can access it with the url below.

http://www.mormonnewsroom.org/article/church-discipline

There is also a Gospel Topic on this subject that includes talks and links to other resources, including the Mormonnewsroom.org article. You can access the topic with this url:

https://www.lds.org/topics/church-disciplinary-councils?lang=eng

 I'll have more to say about this later and will provide some information about what constitutes apostasy.