If an online service provider gets hacked, the hacker has gained unauthorized access to your private/personal information that you entered while creating the account to access that particular service provider. This puts you at risk for identity theft and credit card fraud.
When creating a password, it is best to include special characters and symbols and use a combination of letters and numbers. It is also beneficial to change your password frequently.
You can install anti-virus software to protect your computer from developing a virus. You can back up your data by copying files or using a passport. Lastly, you can use a firewall to prevent your information from being hacked or stolen.
1. Kandela, What Separates Great Internet Service Providers rom Bad Ones, http://kandela.com/separates-great-internet-service-providers-bad/ , 2014