question about parallel and series switching and impedance

Hello so because I’ve always made it easy for myself and only bought LS with 4ohm (without double-swing coil, no dual-subs etc.) I never really got the problem right. but I always get confused because of things like impedance and x ohm-stable. that’s why I have a few funny questions (with LS always only meant a one-way LS like e.g. a sub to keep it easy) if you are running parallel or rowing from 2 LS e.g., then the talk is about a ka nal the end stage or? so if I have a 2 channel end stage and have a channel with an LS and have the 2th channel with the 2nd LS then this is also not a row and also no parallel circuit or? only when I connect 2 LS to a channel can I speak of row or parallel circuit, is that true?? the first picture should represent a row circuit (K1=channel 1) is that right as I drew it?