You can turn on Two-Factor Authentication on Twitter for an extra layer of security. After this you will receive a code to your device to authorize the login to your Twitter account. This helps keeping your account safe against unauthorized access. Here are the steps for the same.

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Turn On Two-Factor Authentication on Twitter

1. Click More in the menu at the left side in your Twitter dashboard
2. Click Settings and Support > Settings and privacy
3. Click Security and account access > Security
4. Click Two-factor authentication
5. Here you have 3 options
   

Related: How to Integrate One-Click Twitter Login to your WordPress Website

Turn On Two-Factor Authentication on Twitter via Text message

1. Select Text message
2. Read the overview instructions. Click Next
3. Enter your password. Click Verify
4. Confirm the email associated to your Twitter account if not done already. Enter your email address, then click Next. You will receive a confirmation code via email. Back in your Twitter account, enter the code in the prompt. Click Verify.
   Note: If you don’t already have a phone number associated with your account, you need to enter it. Additionally you can choose to deselect the option to allow your existing contacts to find you on Twitter. 
5. Enter the confirmation code you received via text message. Type in the code, you will see a confirmation screen with a backup code. Save a screenshot of the code in case you need it for future use. This will help you access your account if you lose your mobile phone or change your phone number.
6. Click Got it when you are finished with this screen.

Now, when you log in to your account on Twitter, a six-digit code will be sent to your phone to use during login. This ensures only you can login to your Twitter account.

Turn On Two-Factor Authentication on Twitter via Authentication app

1. Select Authentication app
2. Read the overview instructions. Click Start
3. If prompted, enter your password. Click Verify
4. Confirm the email associated to your Twitter account if not done already. Enter your email address, then click Next. You will receive a confirmation code via email. Back in your Twitter account, enter the code in the prompt. Click Verify
5. Link your authentication app to your Twitter account by scanning a QR code. (If you don’t already have an app installed on your device, you will need to download one. You can use any time-based one time password (TOTP) authentication app like Google Authenticator, Authy, Duo Mobile, 1Password etc.)
6. Scan the QR code. Click Next
7. Enter the code generated by your authentication app. Click Verify
8. You will see a confirmation screen. Click Got it to finish setup

Now, you can view and use codes to login to your Twitter account via your authentication app.

Turn On Two-Factor Authentication on Twitter via Security Key

1. Select Security Key
2. Enter your password when prompted
3. Confirm the email associated to your Twitter account if not done already. Enter your email address, then click Next. You will receive a confirmation code via email. Back in your Twitter account, enter the code in the prompt. Click Verify
4. Read the overview. Click Start
5. Insert the key(s) into the USB port of your computer or sync it over your computer’s Bluetooth or NFC. Once inserted, touch the button on your key
6. Follow the on-screen instructions and finish the setup
7. Your security key(s) will appear in the Manage security keys section under Two-factor authentication. From there, you can rename or delete your security key(s) and add additional security keys to your account at any time.