Folks, I need a bit of help to understand Lightning.

I have a few questions (and they might be a bit dumb):

1. „Opening a channel“ is my first tx with another person, right?

2. What is it called to send my first tx from on-chain to my Phoenix wallet? Is this also „opening a channel“?

3. If I download a wallet on a friends phone and want to send him some sats but he doesn’t have any sats in the wallet, it isn’t possible because he needs sats first to have impound liquidity, except he is using a wallet with an integrated LSP that provides this for him (by doing some magic in the back round)?

4. This is the weirdest concept for me. Let’s say I have a payment channel with Bob. Bob sent me 120 sats. I send Bob 100 sats. I am dishonest and want to close the channel with the “receipt” of when Bob sent me 120 sats. I close the channel and broadcast my tx on-chain. Now Bob has let’s say 7 days to go on-chain and catch me cheating. But Bob decides he doesn’t care about on-chain because he only uses LN anyway. So he sends the 100 sats the he thinks he has (from me) to pay Alice. Now Alice has the 100 sats that I try to steal from Bob. Now Alice buys something with the 100 sats from Joe. Now Joe has my 100 sats that I am trying to steal. After 7 days neither Bob, Alice or Joe go on-chain and I am able to steal the 100 sats without getting caught. On-chain I own the 100 sats. But what happens with the 100 sats that Joe apparently owns in his LN wallet?

I hope anyone with a deep understanding sees this post and is willing to answer.

Please share if you don’t mind for better reach.

Cheers