As others have pointed out, it's hard to take this post seriously because of how poorly the site is implemented...but beyond that, the advice seems either painfully obvious or outright counterproductive.

Moreover, it depends what kind of web development you want to do.

If you want to work as part of a team in a top shop, then sure, know frameworks and write perfectly linted code. However, if you're a freelancer who survives by making small commercial sites, then you're working with people who don't care about a third of a second difference in load times. Or, they'll care way more that you get a button hover-animation to look slick than they will about downloading jQuery uncompressed. And if you're a freelancer/outside-party, you're not going to be able to insist on their IT to use your deploy processes anyway, so minifying/jammiting in a productive way may not even be an option.