We recommend you to use Google 2-Factor Authenticator for improving the security of your account. Here you can watch a short explanation of it
Active 2-Factor Google Authenticator for your account, step by step
1. Download the app from Google Play for your android
Download from App Store for your iOS
2. Go to Security on your account
3. Swipe to the right to enable the Two-Factor Authentication
4. Now, you just have to scan the QR CODE and enter the 6 digit code
That's it, you did it! You have done well, your account is more secure now.