Now a days email account is easily hacked by Professional hacker. here is some tips to how to prevent your account from hacker. Must Follow this.
>> Always configure a Secondary Email Address for the recovery purpose.
>> Add your phone number and security question in your email account.
>> Select strong password.
Like >> *knowLedgefactory@6May2012@aug2012@facebookgroups# Use some character in ur password. This password is easy to remember but it is not easy to hack.
>> Change your password after one month or 15 days.
>> Take Care of the Phishing Links. Do not Click one any link like security purpose or something like that.
>> Do not Share your password to your Friends or anybody.
>> Do not use other computer for check your mails.
>> Turn one 2 Step Verification in gmail account.
>> Always use https:// Do not use http://