As I am a beginner to ASP.NET MVC, I would like to know what are the best data access methods for ASP.NET MVC?
This is somehow subjective. There's no such thing as best data access method for ASP.NET MVC. This will depend on your application requirements and specific needs. There are many different ORM frameworks you can choose from such as NHibernate, Entity Framework, Linq to SQL, ... (If there was a best framework this list wouldn't be so big).