Links and Tools - Short Cuts
A set of useful links
Portal - New release information
Dynamics - Latest updates and hotfixes
https://support.microsoft.com/en-us/help/3142345/microsoft-dynamics-365-updates-and-hotfixes
Excel - Using structured table references
One i use a lot when prototyping in excel is using table references it helps both business users and developers understand the design of the solution.
Tools - Useful links to tools for building good dynamics solutions
Metro Studio useful for generating icons, good selection free to use
Balsimq useful for creating wireframes when prototyping, the hand drawn nature takes the focus away from style to content and layout. Free to try