Few days ago I found some Gmail SECURITY Tips from their blog itself!
Following are the tips discussed in the blog:
- Remember to sign out
- Be careful about sending certain sensitive information via email
- Enable “Always use HTTPS”
- Be wary of unexpected attachments.
- Make sure your account recovery information is up-to-date
Visit Gmail Blog to read the security tips in detail.
Related Useful Links:
Have a Safe Browsing Always! 
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