As an actual person employed as a designer and developer, I find articles listing arbitrary design rules very strange indeed. This is like someone enforcing you to use a coding style before you've even learnt the basics of programming.
All these rules will do is ensure you create a website that looks mostly like one designed by the person who has written the article. If you want to create a landing page for genericstarup.io, then maybe that's fine, but it's kind of like building a website by exclusively copy pasting tutorial snippets that you don't understand.
I also disagree quite strongly with the rules laid out in this particular article, but that's another issue...
All these rules will do is ensure you create a website that looks mostly like one designed by the person who has written the article. If you want to create a landing page for genericstarup.io, then maybe that's fine, but it's kind of like building a website by exclusively copy pasting tutorial snippets that you don't understand.
I also disagree quite strongly with the rules laid out in this particular article, but that's another issue...