Maybe I'm the wrong audience for this (I have degrees in CS and Education and have worked in both fields) but this seems very simple/rudimentary and for the most part, doesn't really seem useful. Feels more like an ad for the link at the end.
"if you can’t do then teach! ;)" Maybe the winking face was meant to indicate that this is tongue-in-cheek but nothing else in the article really serves to support that. I dislike this phrase in general.
Each section seemed too cursory to provide any meaningful insight. As a teacher, I'm used to having people with less expertise offer me advice like "Use real world examples if you want to be effective." So, uh, use the vehicle, car, truck, etc... analogy when discussing superclasses and subclasses. Okay. Can you provide something else that's not so superficial? And calling words like "polymorphism" mumbo jumbo doesn't really help either. It's domain specific language that you should introduce eventually while making connections (both to other content in the domain and real world phenomena). Of course using those words without sufficiently explaining them isn't enough but shying away from key vocabulary because you underestimate your student isn't the best policy either.
"So if someone is not getting what you’re saying, try rephrasing your words and approach it like it’s a challenge on your end, not theirs." I think this is a good point and could be insightful for people who haven't taught before. Anyone that engages in teaching should hopefully realize it is a skill that takes effort, practice and reflection to hone (like any skill). You won't be perfect from the beginning. Assume your students are trying their best to understand and you are both trying to work together to build the connections needed to reach understanding. But if you're going into this thinking teaching is just a thing people do and your goal is to become a better programmer, I think there are more efficient ways to achieve that. You must be willing to put the time and energy into working on your teaching before you start seeing the benefits.
"it must be clear who is leading the way." Hmm... Definitely disagree with this. In the beginning I'm leading and directing but I'm trying to build skills, confidence and motivation such that control is slowly shifted to the learner (Student-led instruction is a big buzzword (buzzphrase?) in the edu world). I want my students to become independent so that whenever they leave me they can continue learning on their own. Going from having a boss/teacher that always takes charge to the "real world" of learning and doing all on your own can be disorienting. Let the student take the reigns so they get experience making decisions on their own while you're still there to offer guidance.
Sorry if this came across as harsh, I hope it can be taken as constructive criticism as opposed to me just being mean spirited. I definitely appreciate the subject of teaching popping up on hn.