SNOT techniques deal with all ways of building not stacking parts with studs oriented upwards. SNOT (Studs Not On Top) is a very general term and there are many different SNOT techniques.
Generally termed advanced, models built using these techniques are more detailed and in official sets these techniques are restricted to older age groups.
You know what my days used to be like? I just tested. Nobody murdered me. Or put me in a potato. Or fed me to birds. I had a pretty good life. And then you showed up. You dangerous, mute lunatic. So you know what? You win. Just go. Don't come back.