Developer Guide for Dynamics 365 Customer Engagement
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/developer-guide
Best Practices
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/best-practices-sdk
REF - Dynamics CRM Development Standards
https://blogs.msdn.microsoft.com/darrenliu/2010/07/23/dynamics-crm-development-standards/
Sample code directory for Dynamics 365 Customer Engagement
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/developer/sample-code-directory
Dynamics 365 Website
https://dynamics.microsoft.com/en-us/
Dynamics 365 documentation
https://docs.microsoft.com/en-us/dynamics365/
Business Applications Release Notes
https://docs.microsoft.com/en-us/business-applications-release-notes/index