Two things I learned on day one, 1) not your keys, not your coin. 2) don’t keep any more in your lightning wallet than you’re willing to lose.
Both of these are clear and concise, but sadly, there is no protocol for onboarding so there is no way to guarantee every new user learns this.
I’ve been saying it for quite some time, you are never going to gain users outside of the tech bubble until it’s easier to use, closer to what they’re used to, and to educate them.