Okay, things to learn about Nostr before I start onboarding my Twitter audience

1.) Why am I able to zap some people but not others, even though they have received sats from others?

2.) What is the fastest way to explain the value for value system we have here?

I really want to go on zapping sprees, so if anyone can help me figure that out, I'd be super grateful 🙏

I have a few Twitter friends setting up npubs and looking to explore the site, so I'd to be able to answer their questions as best as possible 🫶