Someone please explain this to my dumb ass.

I have a bitcoin electrum wallet. It has bitcoin on it. I don't intend to set up a lightning node yet. So I can't get a lightning address that way.

I have an invite for alby. I believe I can get a lightning address there.

So here is the questions.

How do I send bitcoins from a non lightning bitcoin wallet address into a lightning wallet address?

How do I send bitcoins from a bitcoin lightning wallet address back into my non lightning electrum bitcoin wallet addresses?

I'm confused as fuck. This is basic shit. Please help me get started zapping on Nostr.