Azure AD B2B: https://docs.microsoft.com/en-us/azure/active-directory/active-directory-b2b-what-is-azure-ad-b2b
Azure AD what’s new: https://docs.microsoft.com/en-us/azure/active-directory/whats-new
Azure AD Blog: http://blogs.technet.com/b/ad/
Azure RMS blog: http://blogs.msdn.com/b/rms/
‘In the Cloud’: http://blogs.technet.com/b/in_the_cloud/
Office blog: http://blogs.office.com/
Intune blog: http://blogs.technet.com/b/microsoftintune/
Azure Active Directory Videos/Demos: http://channel9.msdn.com/Series/Azure-Active-Directory-Videos-Demos
Getting Started with Azure Active Directory: https://msdn.microsoft.com/en-us/library/azure/dn499825.aspx
Set up Windows Azure AD: http://blogs.technet.com/b/keithmayer/archive/2013/04/09/step-by-step-provisioning-windows-azure-active-directory-free-for-production-use.aspx
Azure AD connect: http://blogs.technet.com/b/ad/archive/2014/08/04/connecting-ad-and-azure-ad-only-4-clicks-with-azure-ad-connect.aspx
How to setup a new Windows forest in Azure: http://azure.microsoft.com/en-us/documentation/articles/active-directory-new-forest-virtual-machine/
How to assign Azure AD licenses to user accounts: http://channel9.msdn.com/Series/Azure-Active-Directory-Videos-Demos/How-to-assign-Azure-AD-Premium-Licenses-to-user-accounts
Assign EMS/Azure AD Premium licenses with PowerShell: http://channel9.msdn.com/Series/Azure-Active-Directory-Videos-Demos/Assign-EMS-Azure-AD-Premium-lics-with-PowerShell
Here are list of tip and tricks to use the AADSync tool:
AADSync technet ref: https://msdn.microsoft.com/en-us/library/azure/dn790204.aspx
AADSync blog: http://blogs.technet.com/b/aadsyncsupport/