lighthouse beacon node --datadir

   -d, --datadir <DIR>
          Used to specify a custom root data directory for lighthouse keys and databases. Defaults to
          $HOME/.lighthouse/{network} where network is the value of the `network` flag Note: Users should specify
          separate custom datadirs for different networks.

$HOME/.lighthouse/mainnet/beacon/chain_db/

geth --datadir

lighthouse beacon_node, --execution-endpoint, --execution-jwt, --allow-insecure-genesis-sync, logs, --checkpoint-sync-url, --help, checkpoint sync, beacon.log