Portfolio Page-positioning elements?

I have only completed the navigation bar, but I would like to move it to the right side of the screen instead of the left, is this done with one of the grid classes? I have been reading so much about bootstraps grid system but I still can’t wrap my head around it. Does anyone have a simpler way to explain what col-md-8 and col-xs-12 do for example?

It seems like all the work before didn’t teach us half of what we know for the tribute and portfolio page projects, hence doing lots of outside research. But I am more than up for the challenge!! Anyways here’s what I got so far…