VBA - Summing column excluding first cell

I have a row of values with a header title I would like to sum.

I've looked around and see lots of examples but I'm not understanding the use of quotation marks...and probably some other things.
I understand there is probably a few ways to do this and if someone could give me an explanation of why I would use one over the other that would be great as well.

So Far I have

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This does work, but I basically had to steal it from someone else, and the examples I've seen don't seem consistent. How are the quotation used and the ampersand?
Can this be done in one line instead of two?

Thanks

Jon