Solana stores all the data of the same app / same program in various accounts.

Transaction vs Instruction

Transactions

A transaction in Solana is a bundle that includes one or more instructions. Transactions are used to submit operations or changes to the network. They can be simple, such as transferring SOL between accounts, or complex

Instructions

The core operations that the transaction will execute.

<aside> 💡 There are more concepts like recentBlockchash and signers , writeable that we we will eventually get to.

</aside>

How to create an account with some data

const solanaWeb3 = require('@solana/web3.js');
const fs = require("fs")
const { Keypair, Connection, SystemProgram, Transaction, sendAndConfirmTransaction } = solanaWeb3;

// Connect to Solana devnet
const connection = new Connection(solanaWeb3.clusterApiUrl('devnet'), 'confirmed');

// Generate a new keypair for the data account
const dataAccount = Keypair.generate();
const payer = Keypair.fromSecretKey(new Uint8Array(JSON.parse(fs.readFileSync(`/Users/harkiratsingh/.config/solana/id.json`, "utf-8")))); // This will be the account paying for the transaction

async function createAccount() {
    // Create a transaction to create and fund the account
    const tx = new Transaction().add(
        SystemProgram.createAccount({
            fromPubkey: payer.publicKey,
            newAccountPubkey: dataAccount.publicKey,
            lamports: await connection.getMinimumBalanceForRentExemption(1000), // Amount to fund the account
            space: 1000, // Space in bytes to allocate for data
            programId: SystemProgram.programId,
        })
    );

    // Send the transaction to the network
    const txId = await sendAndConfirmTransaction(connection, tx, [payer, dataAccount]);

    console.log(`Created account with transaction ID: ${txId}`);

}

createAccount();