The first thing you'll notice in this article is that each section header is closer to the previous paragraph than to the next one.
But that doesn't negate the content of the article, it just shows that the author is still a programmer learning to design.
Even with its blemishes, the article still has a nice message: decent design is pretty simple and gets easier if you just keep at it.
para para para para
Header
para para para para
instead of: para para para para
Header
para para para para
Not sure that the ascii art does it justice, but that's hopefully clearer.In this case, the header is closer to the preceding paragraph (~15px) than to the following paragraph (~19px). It's visually implying a connection that doesn't exist, which is why it's problematic.