Your list is great, I was thinking more high level for someone running a self custodial Lightning app such as Phoenix, Breez, Mutiny, Zeus, etc:
  1. Basic 4-7 minute explanation of channels and channel liquidity. This seems to be the most common thing that confuses and frustrates people at any level of LN use. If you don't understand these basic concepts you're in for a world of hurt.
  2. You should do this because you are passionate about the LN and can endure a few bugs/headaches, and not because you want to make a profit. If you can only tolerate a perfect bug free experience then the LN is a few years off from being up to that. It's so early.