Question about MAC addresses

In Summary :

Here's something I don't fully understand. So please just tell me if I'm missing something or get something wrong. I get that a MAC address uniquely identifies your computer's hardware and it can be used to identify you. When you visit a website, they have your IP address which you can hide with a VPN. This obviously isn't foolproof since I've seen webRTC being able to get your actual IP if you have JavaScript enabled but for the average person, it'd be fine. But when you look at all of these guides for being more secure online, they always talk about IPs but never mention MAC addresses and if they do, it's only in passing and is something like "Kali Linux comes with a tool called MACchanger if that interests you". What I don't [...]

kindly refer the following link as follow up :
https://ift.tt/2G4pMw8