Everything you need to know to create Word add-ins
Build your first Word add-in
Create Word add-ins with Visual Studio

Office VBA Object library reference:

This reference contains conceptual overviews, programming tasks, samples, and references to guide you in developing solutions based on Office.

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Office Add-ins platform overview:

Learn how you can use the Office Add-ins platform to build solutions that extend Office applications and interact with content in your Office documents.

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Changelog:

What's new in Word Development? Check out the Office Add-in host and platform availability topic.

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Word blog:

Serving up great experiences with the help of Word.

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