UI Fabric is a Component Library that is developed to reflect the latest Microsoft design language. It is used in many Microsoft web applications and is developed in the open:

https://github.com/officedev/office-ui-fabric-react

Documentation can be found here:

https://developer.microsoft.com/en-us/fabric/#/components

Learn about Components and How to Look up Documentation

Stack
Default Button / Primary Button

Exercise

Open up the Documentation for DefaultButton
Open up the TSX files inside components/
Replace the DOM tags with Fabric components in those TSX files with these components:

Stack
DefaultButton
Checkbox
TextField
Pivot (for the filter)

Bonus Exercise

GO WILD! There are so many components from the Fabric library! Try to put some components in the exercise component files.