核心数据和托管对象上下文

I'm new with Core Data and I have some questions about how to do the things in the right way. I think I need a temporaryManagedObjectContext to work with temporary entities, while user is editing a new entity. When user tap save that data I want to insert those entities in the persistedManagecObjectContext and then saveContext. What is the best practice to achieve this? Since I don't want to save in the temp context, it is mandatory to use threading?I'm new with Core Data and I have some question