> "Which is quite likely to be when their customers' data..."
Who would hire someone who only has W3Schools knowledge? Are we really worried about them?
> Who would hire someone who only has W3Schools knowledge?
And this pretty much negates your whole argument. If you ever plan on getting hired or being taken seriously enough to get clients, this isn't the resource. How pissed would you be to find out at an interview or after a breach that the site you used to learn all this stuff was the laughing stock of developers?
Which is quite likely to be when their customers' data gets leaked or altered. That's a really bad time to discover a hole in your understanding.