Nope*, just one lightning network, which uses Bitcoin UTXO's as the infrastructure between two peers

*there are services that swap in/out from LN to something like Liquid (Blockstreams federated blockchain product [mirrors Bitcoin, with super tiny changes]), but no second layer for other chains

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Ah makes sense. I see, I see. That's neat.

I have a base understanding of lightning. The channels and then how you can route via them etc.

Commit to open channel, do stuff off chain, and commit balences at end.