.NET documentation is really good. I can't quantify it as being the best but there is so much training material out there. Examples: Tons of free video tutoria

.NET documentation is really good. I can't quantify it as being the best but there is so much training material out there. Examples: Tons of free video tutorials: http://www.asp.net/web-forms http://www.asp.net/web-forms http://www.asp.net/mvc http://www.asp.net/mvc http://www.mvcconf.com/ http://www.mvcconf.com/ heaps of books http://www.asp.net/community/books http://www.asp.net/community/books http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=asp.net&x=0&y=0 http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dap... then of course there is the Microsoft Developer Network http://msdn.microsoft.com/en-au/ff380144 http://msdn.microsoft.com/en-au/ff380144 with training courses/hands on labs http://msdn.microsoft.com/en-au/VS2010TrainingCourse_AspNetMvc http://msdn.microsoft.com/en-au/VS2010TrainingCourse_AspNetM... plenty of people who can answer your questions on SO (C# and ASP.NET are a couple of the most popular tags) http://stackoverflow.com/tags http://stackoverflow.com/tags and msdn forums http://social.msdn.microsoft.com/Forums/en-au/categories http://social.msdn.microsoft.com/Forums/en-au/categories if you want to pay for training, there's plenty of that too, as .NET is used lots in the enterprise there is training centres and other paid services a plenty: http://www.learnvisualstudio.net/ http://www.learnvisualstudio.net/ http://learning.microsoft.com/manager/catalog.aspx?brand=msdn http://learning.microsoft.com/manager/catalog.aspx?brand=msd... additionally, they have a certification program with all the training materials and training courses for that http://www.microsoft.com/learning/en/us/certification/cert-vstudio.aspx#tab2 http://www.microsoft.com/learning/en/us/certification/cert-v... I realize that there is probably great documentation for other open source frameworks as well, but I can see that it's likely Microsoft will always have great documentation on the very latest versions of their tools as they pay people to make the documentation, whereas OSS frameworks are more likely to rely on people to write boring documentation in their spare time.