My Blender model pratical

Around December last year (2018), I created a model of a robot-esque human using a 3D software called Blender. Although it's incomplete due to not texturing, this was a done for the intention of practicing on how to create any model. Moreover I did manage to use the armature to rig the model and made it move it's joints but doing so deforms the model. Weight painting allows the model stop the deformation and as you're doing it could get difficult in some areas depending on your model in terms of how your initially modelled it and the amount of polygons you subdivide.

This is the weight painting process. I enabled wireframe to get a better look at the lines to do so. 

 I got few of the references from these videos.