New customers or consultant who wants to get familiar with Dynamics 365 applications can leverage the trial provided by Microsoft to explore Dynamics 365. To start the free trial, simply follow the link https://trials.dynamics.com/, choose an app to explore, provide your work email and get started. Following visual shows the trial sign-up experience as available currently:

Depending on the application selected, you may have to provide additional details before application can be provisioned for you. Trial application comes with guided experience and demo data to make new users easy to navigate, learn and get familiarize with the application.