New to RVing.....please help

I just got a coachmen apex 31' and have been reading all the manuals and watching a ton of videos. And so I went there to where its stored and checked all the inventory that it had. Now there were a few things I had no idea what they were....I was hoping someone on here could help me. Also, I've heard its imperative to get a surge protector for electric hookup, is that true? Here are some pictures of what I'm not sure of. Any help is much appreciated thank you.

Ps I'm adding in all the photos I took just in case you noticed something I didnt.***Link Removed***