In this video, I am going to show you on how to make a symmetrical object by using MIRROR MODIFIER in Blender 2.82.
The Mirror modifier mirrors a mesh along its local X, Y and/or Z axes, across the Object Origin. It can also use another object as the mirror center, then use that object's local axes instead of its own.
So you don't have to do extra works for the other side.
DISCLAIMER:
This is a step-by-step tutorial for beginners. It is quite long for some viewers.