Your First Transaction

import {
  Connection,
  Keypair,
  LAMPORTS_PER_SOL,
  SystemProgram,
  Transaction,
  sendAndConfirmTransaction,
} from '@solana/web3.js';

async function sendSol() {
  // Connect to devnet
  const connection = new Connection('https://api.devnet.solana.com', 'confirmed');

  // Create sender keypair (in production, use wallet adapter)
  const sender = Keypair.generate();

  // Airdrop SOL to sender
  const airdropSig = await connection.requestAirdrop(
    sender.publicKey,
    2 * LAMPORTS_PER_SOL
  );
  await connection.confirmTransaction(airdropSig);

  // Create recipient
  const recipient = Keypair.generate();

  // Create transfer instruction
  const transaction = new Transaction().add(
    SystemProgram.transfer({
      fromPubkey: sender.publicKey,
      toPubkey: recipient.publicKey,
      lamports: 0.5 * LAMPORTS_PER_SOL,
    })
  );

  // Send and confirm
  const signature = await sendAndConfirmTransaction(
    connection,
    transaction,
    [sender]
  );

  console.log('Transaction signature:', signature);
}