 So you don't understand Qmash, not a problem. Qmash is a mix between extrude and merged points. So if you hover your mouse over a face, that face is gonna glow. Then if you get close to a point and you left click, you'll be able to extrude that point in and out. Now the cool part is when you do the same thing but to a point right next to it. If two points get close enough, then they will automatically merge together and create a complete piece of solid geometry. That's really all this does. It's super useful. And the modifiers down here just control the snap distance required before snapping together. The lower the value, the earlier the points start to snap together. Hope that helps and as always, I hope you have a fantastic day and I'll see you around.