People often forget what it's like to learn something from scratch and lose touch with what is "basic." I'm sure everyone here had at least one professor in col

People often forget what it's like to learn something from scratch and lose touch with what is "basic." I'm sure everyone here had at least one professor in college who would go through some long and overly complex explanation, only to conclude with "see! it's so simple!" Learning to think like your audience is one of the more difficult parts of being a good teacher. There's also a temptation to show off. I've seen people advertise their portfolio of tutorials they've written in interviews, or at least point to things they have written to demonstrate their expertise in [some technology]. Being pessimistic, if your goal is more to advertise your skills than to teach then it's likely going to turn out like that. Lastly, writing tutorials/teaching in general is a skill that requires practice. Just knowing a subject really well by no means makes you a good teacher. To that end, a lot of those tutorials are just noise; the number of good tutorial writers is obviously much smaller than the total number of people out there writing tutorials. And, not every teaching style suits every person, so perhaps a tutorial you find confusing is perfect for someone else (and vice versa).