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I want to write a website that follows Best Practices with my choice of staying the HTML. <br />
<br />
1) Should ALL styling reside in a distinct CSS file? Or are there exceptions?<br />
2) What about HTML5? Should I only use HTML5? <br />
3) I plan on writing it using MS MVC3, so is Razor HTML5 compliant?<br />
4) Where can I lean what calls have been deprecated?<br />
<br />
Thanks.
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I want to write a website that follows Best Practices with my choice of staying the HTML. 

1) Should ALL styling reside in a distinct CSS file? Or are there exceptions?
2) What about HTML5? Should I only use HTML5? 
3) I plan on writing it using MS MVC3, so is Razor HTML5 compliant?
4) Where can I lean what calls have been deprecated?

Thanks.

Following Best Practices with HTML

The successor to Active Server Pages, ASP.NET websites utilize the .NET framework to produce dynamic, data and content-driven web applications and services. ASP.NET code can be written using any .NET supported language. As of 2009, ASP.NET can also apply the Model-View-Controller (MVC) pattern to web applications

ASP.NET

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.