1, things you know about
2, things you don't know about (this article as an example)
3, things you don't know you don't know about (hackernoon and medium are full of this kind of c*ap, people creaming their pants over switching their computer on for the first time)
There's absolutely zero value in the last two, they add so much noise and worse they make the author look like a complete idiot, even if they're not. I genuinely don't understand why people are so insistent on broadcasting their ignorance/stupidity though?
The only article of worth is the first kind, writing about your subject area, that adds value and is how people learn.