Enable 2-step verification

To ensure your Gmail is safer than you should perform 2-step verification. When you do this, every time you sign in Gmail will be a message sent to your phone number verification code, without this code you will not be able to log in to Gmail. This is one of the security features of Gmail immensely and you lose your ability Gmail account will become harder.
The steps to verify your account by 2 steps:
First: you log into your Gmail account, enter your phone number to verify your account. Can use a phone number for many different accounts
Step 1: You access https://www.google.com/settings/personalinfo
Step 2: Click Security, Sign into Google, and select 2-step verification.
Step 3: you select "Start setting"
Step 4: Fill out your phone number to retrieve a verification code via SMS or can be voice call. Usually, select SMS and click on send code

Step 5: Have mooth code sent to your phone 6 electrical car you fill the frame number and press Verification
Step 6: Set up a reliable computer. If you're using a personal computer, you can tick the box Trust this computer to log on the computer Gmail then this will not be asked again 2-step verification, and vice versa. Click Next to continue.

Step 7: Click Confirm to agree to allow 2 - step verification for Gmail.

Now that you've turned on 2-step verification feature for Gmail. From the next time you log in to Gmail, you'll be asked to enter a verification code sent to your phone, without this number, you will not be able to log in to Gmail (The computer is selected as Sentiment information will not be required 2-step verification as well).
=>> Gmail.com sign in problem: forgot your password
Good luck!