Review a list of properties of the SPSite, SPWeb, and SPUser classes that are read/write in farm solutions are read-only in sandboxed solutions.
Read an online chapter that discusses objects that are supported by the Client Object Model, how to update a site title by using the Client Object Model, common list operations, and using jQuery with SharePoint 2010.
Read an online chapter that discusses Silverlight features and tools, how to create a Silverlight Web Part, how to access SharePoint 2010 data by using the Client Object Model, and how to extend Visual Studio to create Silverlight solutions.
Read an online chapter that discusses web services that are native to SharePoint 2010, building custom web services, and implementing custom web services by using different client solutions in SharePoint 2010.