How to Send SOL

To send SOL, you will need to interact with the SystemProgram.
import {
  address,
  lamports,
  createTransaction,
  createSolanaClient,
  signTransactionMessageWithSigners,
} from "gill";
import { loadKeypairSignerFromFile } from "gill/node";
import { getTransferSolInstruction } from "gill/programs";

const { rpc, sendAndConfirmTransaction } = createSolanaClient({
  urlOrMoniker: "devnet",
});

// loads Signer from the default Solana CLI keypair path: `~/.config/solana/id.json`
const signer = await loadKeypairSignerFromFile();

const destination = address("nick6zJc6HpW3kfBm4xS2dmbuVRyb5F3AnUvj5ymzR5");

const { value: latestBlockhash } = await rpc.getLatestBlockhash().send();

const tx = createTransaction({
  version: "legacy",
  feePayer: signer,
  instructions: [
    getTransferSolInstruction({
      source: signer,
      destination,
      amount: lamports(1_000_000n),
    }),
  ],
  latestBlockhash,
});

const signedTransaction = await signTransactionMessageWithSigners(tx);
await sendAndConfirmTransaction(signedTransaction);