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You are currently looking at documentation for Umbraco 8 and older versions.
An automated guess is that docs.umbraco.com/umbraco-cms/reference/management/ could be the link to the new documentation for Umbraco 9 and newer versions.
Details of CRUD operations within Umbraco and how to interact with the data persisted in the database
The intended audience for these reference pages are .net developers, it is assumed the reader already has a knowledge of the basics of Umbraco and knows .NET & C#.
Here you will find references for the models in the public api including the Content, ContentType, DataTypeDefinition, DictionaryItem, Language, Media, MediaType, Relation, RelationType, Task, TaskType and Template classes.
Here you will find references for the various services which are available for performing CRUD operations for the models mentioned above.