Google have various services. You can use Google various service after sign in Gmail account. You can send and receive email using Google mail service. Learn how to sign in your Gmail account.
1. Type your web address bar google.com and click web bar arrow icon to open Google website.

2. You will see Google homepage with Google search box and few buttons with text. Click Gmail text from right sight.

3. You will see recently sign in email list. Click up to your email address with your name which emails address are you want to sign in.

4. After click you will see your name with email address, password box and Sign in button.
- Click Password box and type this email address password.
- Click Sign in button to sing in this email account.

5. You will see this email account mail inbox with your incoming email. Click any email subject to check this email.
Using this way you can sign in your Gmail account using your previous login email address.