As you can see the nodes setup could not be any simpler, as it’s shown in this video tutorial, by TutsByKai.
Feel free to inspect my .blend file:
toonshadernotworking.blend (667.6 KB)
Thank you in advance guys 
On properties/material/settings, change blend mode to opaque or alpha hashed.
Mmm, where is Properties?
Properties viewport? By default, on the lower right corner of your screen. Or, change any viewport to a properties viewport if you want.
Of course!
Yes, I know what you mean 
It was as Alpha because the original material was used for an “Image to plane” object. I should have just used a brand new material (rolling eyes).
Thank you bandages