It didn’t really explain my questions unfortunately. I’m reading the wie passiert right now. As a non-native English speaker and non-technical person it isn’t easy though 😅
Discussion
White paper*
The Lightning Network requires several computers to remain connected to it to allow quick and efficient fund transfers. A high number of computers connected to it also ensures an adequate level of BTC funds is available for transactions. To prevent fraudulent transactions, the Lightning Network has a ‘watchtower’ system that detects users who try to prematurely close channels by abruptly disconnecting from the network. Found this on the internet. Does it answers your question 4? :)