These are good questions and I am not claiming to understand all of lightning either. Also, it solves some issues of Bitcoin but brings other problems (notably around security).
Overall it is a routing channel between two nodes (here two Strike users), you can view it as a payment infrastructure such as swift or sepa. Contrary to layer 1, Lightning is not waiting for new blocks, it processes all payments between nodes and only broadcast them by batch to layer 1 once the transactions are over.
Last time I made a payment with it, I sent $1000 for 10 millisats ($0.00000…01) and it took a few seconds to be confirmed.
It is truly fascinating to me because this technology might allow us to perform stream of payment in the future.
Edit (many typos) : a good parallel is communication, between sending a letter (wire transfer) and sending a message on whatsapp (lightning)