Go ahead and install enduro globally by running
npm install enduro -g
Create a new project by running
enduro create helloworld. Now just cd into the created directory
Now that you created an enduro project, just start enduro in a development mode:
$ enduro dev.
Enduro's development mode has all the build tools ready for you to build your project as comfortable and efficiently as possible. Just try to change /assets/css/main.scss file.