I turn the key and nothing happens,, could this be a fuse?
Battery is good... turn key and nothing happens.
Headlights don't work either now
If nothing happens when you try to start and the headlights won't come on, you likely either have a blown mega-fuse under the hood; it's the big one that's bolted in, or a loose or defective battery cable. That's if the battery is truly OK.