Identifying Fake LEGO Technic parts [Guide]

A few months ago I was sold a bag of Technic parts and although I've been in the LEGO scene for about 5 years now, I wasn't able to tell immediately that I had a bunch of fake parts intentionally made to deceive me! I've since learnt that knowing the LEGO System Bricks did not prepare me with the skills of being able to identify Technic Parts. I was delighted to see that Steve Tan put this guide together to help distinguish the difference between LEGO and Non-LEGO parts. [Updated: 26 Jan 2020]