Uisng Kendo Editor for MVC is the same as if you are going to use a plain textarea form element and save its content to the database.
Particularly, saving to database is not a topic covered by any UI component, but server-side code implementation. Thus, this will not be explained in details as this is a plain technique of saving a string to a database field.
Kendo Editor utilizes a hidden textarea that has the name and id field set to the value passed in the Name method of the Kendo().Editor() helper. That said, in order to submit the text to a controller you will need a form and a submit button, where the form will navigate to the controller action and the submit button will just trigger the submit action. This is plain HTML form handling and there is nothing more complex when it comes to Kendo Editor.
As with any form submitting to MVC action, the form fields are captured in the method overload (the parameters). Thus, the Name method (id and name of the textarea) will be available in the controller action by a parameter with the same name. http://docs.telerik.com/aspnet-mvc/helpers/editor/overview#server-value-processing
All that is utilizing native HTML and MVC techniques and all those are considered as general knowledge for ASP.NET MVC development. You can also check out this resource: https://blog.michaelckennedy.net/2012/01/20/building-asp-net-mvc-forms-with-razor/.
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