Dual Screen on Mac

Been using a Mac for a month or so now and I'm really enjoying it, but there are a couple odd things I haven't figure out yet.

When I have a second monitor plugged in, is there a way to switch between desktops on the main screen but not on the 2nd monitor? I like to watch Netflix on my 2nd monitor and it's really annoying to lose what I'm watching every time I switch to the Dashboard on my Main Monitor.

Any way to have the 2nd monitor be its own instance, rather than an extension of a particular Desktop?