Blender help! Very basic problem

Uhhh very beginner thing, I realized i’ve apparently never really thoroughly used blender to make detailed builds and stuff. I’m making a house build, and you know how when you put two objects together, the inner/touching side z fights, right? Obviously you cannot see that part, so do you bother fixing it? Is it the same for edges overlapping n z fighting?

Resize the side of your mesh that’s causing the z-fighting by 0.000001 in it’s normal direction or any number too low to be noticeable. But if it’s in a part of the mesh that normally isn’t viewable then i don’t bother fixing meshes like that for my cases. And i’m pretty sure z-fighting only occurs when faces overlap each other, not edges or vertices.

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Thank you so much! If there’s a lot of edges in one place, do I merge it? (to fix it?) Is fixing it necessary?

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What do you mean by multiple edges in one place? do you mean like parts touching each other? Or parts directly intersecting each one’s geometry?

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sorry my explanation was bad… I found out it happens when I extrude; when I extrude an object, the number of edge multiplies. For the places that are visible, I merge it to fix it, is it necessary to also fix the parts that are not to be seen?