What you said is perfect. Often new player worries about the smash that is coming and tense up/holding the grip too tight. Stay relax and just hold the grip tight enough so it will not fall out. I like to keep my racket head at chest level and in front of my body so I can 'get to the shuttle' earlier.
I love your practical approach of videos, where you actually let some amatuer or intermediate player play and then show the mistakes. It gets easy for us as well to specifically notice the mistakes which we were commiting as well, instead of those regular coaching videos where they just show us by doing the moves. Its not easy to learn that way. One thing though try and show video from different angles and not just back and pks improve the subtitle, sice we solely depend on them 😁 Love from India✌