Providing Help 
You can offer the users various kinds of help for working with your application:
Facilitate user input by providing the set of valid values
More information: Offering Input Help
React on user interaction throwing meaningful user messages
More information: Showing Messages After User Interaction
Facilitate handling of your application by showing UI texts in user's login language
More information: Internationalizing Applications
Provide technical information for Web Dynpro units such as components, applications, or views (documentation from developers for developers) More information: Providing Documentation for Developers