At 4:16 in the video you open a menu to insert keyframes. You don't tell us how to do it though. It would be really nice if you did so, not only the hotkey, but also how to open it without a hotkey (so we can look it up again if we forget the hotkey). I looked everywhere in the UI and couldn't find the place to open that menu.
Hi, on this page of the blender manual you can find all the info on how to add keyframes (including in which menu you can find this):
https://docs.blender.org/manual/en/latest/animation/keyframes/editing.html#insert-keyframes
No problem, we all get stuck or frustrated sometimes, better to ask than to give up so never feel bad for asking a question. Keep it up 😊👍🏻
