Basics of a Smash Route

I have a question about the "Smash concept" and "smash route." I have been looking at a ton of diagrams and plays involing the smash concept.Now, is there just one route within the 2 main routes that is THE smash route? Like is the corner/post corner known as a smash route, or is the hitch known as a smash route? It seems like people refer to both of these together as the smash route,although this makes no sense since a route is just one single path,not 2 together.

Also, is the smash conept ,or route, used to just one side(playside) of the field, and anything can be done on the other side of the field? Or is it always used on both sides of the field?

I saw the other post about the smash on here.But It was bothering me because obviously a route is ONE route, not really two together.Any help on the basics of this would be appreciated, thanks.