[Problem]Related to edges of any object in blender

If I create a 3-D view of an object, the edges of the object or the structure are not quite straight.They are a bit zig-zag. What should I do? plz suggest some solutions.
I have attached an image related to the problem.

Hello!
“Are not quite straight” means perspective view mode, try ortho view - press 5 - to switch persp/ortho views.

I mean the lines or the edges of model are blurry like zig-zag in perspective view mode.

Ok, actually i think its ok) I have same lines

but in the lecture videos they have proper lines.is that depends on resolution

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