What is difference between project specific ledger account-id and account in NNS?

Developers Getting Started
2
  1. Yes, you can use dfx identity -h to list how to create a new account with new private key.
  2. You can use dfx ledger -h to list how to transfer ICP. More info:
    List_neurons: how to get list of (active, dissolving, dissolved) neurons belonging to principal id - #2 by cryptoschindler