Microsoft has put together a lot of helpful resources to help people get on board the Windows 10 as power users. You even get reward points for the Microsoft Virtual Academy one.
The most helpful is Getting Started with Windows 10 Microsoft Virtual Academy video tutorials.
And if you're more tech/developer inclined there are other resources you might want to access.
What’s new for developers in Windows 10
Tools for Every Developer and Every App
MSDN Channel9 Windows 10 tutorials
Get started with Windows apps
Design UWP apps
I would be using a lot of these tutorials too.