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Also to your point, the latest LiveView release moved some helper utilities around and you need to add "import Phoenix.Component" in places. I could be wrong but I think the latest live code gen still isn't setting up correct imports. More info here: https://github.com/phoenixframework/phoenix_live_view/blob/master/CHANGELOG.md
I discovered Elixir/Phoenix/liveview about a month ago and also learning. I found Livebook guides extremely helpful to both explain and get hands on with Elixir concepts. Download livebook and open some of the tutorials there, you won't regret it.
If I were you, I would start trying to reproduce this locally. Pretty much all of the logic that goes beyond the autogenerated stuff is in the folder I linked to.
I suggest cloning down an actual LiveView project (maybe this one?) and making changes to it. That will help you get a grip on things more easily than trying to build something from scratch right away.