There are a number of ways to learn about Dynamics 365 and its family of products. Whether you are technical or business focused, a solution architect, developer, product owner, business analyst or QA/tester. Microsoft and the community have a wealth of material available for you to discover and explore.
Here are a few reference points I recommend for you.
The purpose of this wiki is to provide a comprehensive guide for IT professionals to learn about then implement, configure, customize, maintain and support Microsoft Dynamics CRM.
Just like the CRM SDK, CRM Forums, books and CRM Blogs, this repository of CRM knowledge based articles and general Dynamics CRM information is a great place to learn and expand your CRM knowledge. The CRM MVP’s and various others have been working hard to build up a knowledge base to help the community find useful information with topics covering a wide array of Dynamics CRM and related technologies.