All A lot of good things in this life are free. Including, as it turns out, some awesome CRM training videos.
There is, I kid you not, the whole TRAINING TAB in the Dynamics CRM section on YouTube, and after a release becomes publicly available, Dynamics CRM Support Team publishes awesome training videos about the new features for all the world to share. The latest and greatest Spring 2015 content has been updated here, covering different features, changes from previous releases, and best practices.
Go to https://www.youtube.com/user/msdyncomm/DynamicsCRM, click on Training tab on the right and be trained!