NOOB Questions Samsung SM-G900A

I have been looking one source of solid information in this phone but seems to have too many conflicting opinions.
I have not rooted a phone before, but I'm comfortable following directions and taking things step by step. I have built many PCs, repaired laptops, installed OSs, even some analog cable and satellite "testing" in the past.
I have Nougat on my tablet and it looks pretty cool so far. I was wondering if I can root/mod and load Nougat on my phone. It seems that many places say YES, the Galaxy S5 can get Nougat. Only to find a note somewhere in the instructions that the SM-G900A is not supported, just about every other one is.

Can I root this phone?
Can I put Nougat on it?

Is there really any benefit to doing either or would I just be wasting my time.

Can I go back to the stock AT&T software if I have issues?
If I do that will it go back to the ORIGINAL OS that was on it or back to the current version of Marshmallow that I have on it now?

Thanks, any suggestions are welcome.

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