Battery Hooked up Backwards

Hi All,
I went to change battery and hooked up battery the wrong way. Such an easy task and just wasn't paying close attention to what I was doing.

Immediately when I saw and smelled electrical smoke I unhooked the battery and corrected my mistake. Now as I expected, car does not start and gauges, radio, lights are all not working. Electrical is not something I know well(obviously). Where do I start and what damage can I expect to have? Fusible link box smells and definitely something fried in there. If that fries, does it protect the other electrical components in the car? Would replacing all fuses rectify the issue? Alternator? I don't know where to begin. My mind itself it fried from home reno and kids.

Thanks in advance