The lightning network is not a good example of an L2, it's extremely basic state channels and won't scale because of routing / liquidity issues.
Look into Optimism and Arbitrum for current technology, or zkSync, Starknet, Polygon zkEVM for next gen L2's coming soon. There's a big list of all the current L2's and their tradeoffs at https://l2beat.com
Look into Optimism and Arbitrum for current technology, or zkSync, Starknet, Polygon zkEVM for next gen L2's coming soon. There's a big list of all the current L2's and their tradeoffs at https://l2beat.com