@omar I think I´m obsessed with finding out why, cuz good topology goes a long way, and there just aren´t enough clear answers on what really is causing which issue and why. I mean take this Subsurf shading issue as an example, some say Ngons are the issue, then Creative Shrimp (ditched that course for now cuz too advanced) says Ngons are fine, Poles are the issue, and later down the course I see the shading gets fixed while there´s still a pole sitting right on the edge where the corner turns, It´s really confusing when you touch the issue for the first time(or after several times, if you just aren´t sure what´s causing the issue.
So i wanna build the house but I also really want to know why there´s a shading issue on the house, cuz if Ngons are fine, Poles are ok sometimes, then clearly I don´t know what´s causing what