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Using Raw Transaction

Eth Transaction​

// First step: initialize web3 instance
import { Web3 } from 'web3';
const web3 = new Web3(/* PROVIDER*/);

// Second step: convert private key to account
const account = web3.eth.accounts.privateKeyToAccount(privateKey);
// Make sure the account has enough eth on balance to send the transaction

// Third step: sign and send the transaction
try {
    const signedTx = await account.signTransaction({
        from: account.address,
        to: '0x7ab80aeb6bb488b7f6c41c58e83ef248eb39c882',
        amount: '0x1',
        gas: '100000',
        // other transaction's params
    });
    await web3.eth.sendSignedTransaction(signedTx.rawTransaction);
} catch (error) {
    // catch transaction error
    console.error(error);
}

List of references:

Contract Transaction​

// First step: initialize web3 instance
import { Web3 } from 'web3';
const web3 = new Web3(/* PROVIDER*/);

// Second step: convert private key to account
const account = web3.eth.accounts.privateKeyToAccount(privateKey);
// Make sure the account has enough eth on balance to send the transaction

// Third step: sign and send the transaction
try {
    // deploy
    const contract = new web3.eth.Contract(ERC20Token.abi);
    const contractTx = contract.deploy({
        input: ERC20TokenBytecode,
        arguments: ['1000000000000000000'],
    });
    const signedTxData = await account.signTransaction({
        input: contractTx.encodeABI(),
        from: account.address,
        gas: '10000000',
    });
    const deployResult = await web3.eth.sendSignedTransaction(signedTxData.rawTransaction);

    // call method
    const toAddress = '0x7ed0e85b8e1e925600b4373e6d108f34ab38a401';
    const contractDeployed = new web3.eth.Contract(ERC20Token.abi, deployResult.logs[0].address);

    const balance = await contractDeployed.methods.balanceOf(account.address).call();
    const contractMethodTx = contractDeployed.methods.transfer(toAddress, '0x10');

    const signedMethodData = await account.signTransaction({
        input: contractMethodTx.encodeABI(),
        to: contractDeployed.options.address,
        from: account.address,
        gas: '4700000',
        // other transaction's params
    });
    await web3.eth.sendSignedTransaction(signedMethodData.rawTransaction);
} catch (error) {
    // catch transaction error
    console.error(error);
}

List of references: