1. Microsoft Dynamics 365 On-Premise Cumulative Updates
   • https://support.microsoft.com/en-in/help/3142345/microsoft-dynamics-365-onpremise-cumulative-updates
2. Referencing Blogs:
   • Microsoft Dynamics365 Blog
   • Dynamics Community
   • Microsoft Dynamics Team Blog
3. If you have an idea, what Microsoft should consider in their development for Microsoft Dynamics CRM, you can add this idea to the idea-collection:
   • https://ideas.dynamics.com/ideas/dynamics-crm
4. Also very helpful is the blog considering the current build number of CRM and also linked to the downloads from Microsoft:
   • https://buildnumbers.wordpress.com/crm/
5. If you develop java script code in Visual Studio, you may need this snippet, as it helps you with the code IntelliSense:
   • https://marketplace.visualstudio.com/items?itemName=JLattimer.dynamics-crm-js

Also some useful books: