In the next step you define which column contains your start date, the end date etc.
There are some nice features that come with Full Calendar, for example the integration with Google Calendar and JSON (APEX WebService URL). Another interesting feature is the export to different formats like iCal and CSV.
Finally running the page shows you the new CSS Calendar. You can change the color scheme of the calendar by changing the css.
This CSS calendar is also responsive... when you make your screen smaller the calendar automatically switches to the Week view.
The only thing that's missing with this calendar is a year view... there are people who created extensions for example here and here to offer the year view. Hopefully version 2 of FullCalendar will add the year view native. Wonder if the final release of APEX 5.0 will include the year view too...