1. The history of cash...
  2. Why Bitcoin... (Wtf happened 1979)
  3. How Bitcoin works (users, nodes, miners - mempool.space)...
  4. seedsigner & specter diy with seedsticks
This in short terms...
I dont think it makes sense to start with second layers. You first need to know what bitcoin is... If you start with something like WOS, its not (realy) your bitcoin. If you start with Phoenix, they wont get it...
Also I say: Dont buy bitcoin, study bitcoin 100 hours, because then you will buy bitcoin anyway with the little difference how to handle it! ;-p