Cloud accounts
If you back up your files to the cloud, remember that even though you delete them on your computer or mobile device, they’re still stored in your cloud account. To completely delete the file, you’ll also need to remove it from your backup cloud account.
Online transactions
Don’t use public computers or public Wi-Fi networks to make any transactions. The machines might contain malicious software that can collect your credit card information, and criminals could also be monitoring public Wi-Fi networks for similar information.
Web browsing
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Also, it should go without saying, but in general, don’t click on suspicious links or browse unsafe websites. Only install applications that come from trusted, well-known sources. And be sure that the operating system and apps on your computers and mobile devices are updated with the latest versions and patches.
Here are some more specific tips for different Internet activities:
Email and social accounts
Think twice about what you post to your social networks, and monitor what others are posting about you. There’s a chance that hackers might use your social profile pages to gather personal information about you, and try to guess your password or answers to your secret question.
Related to that, check your account’s privacy settings to make sure you’re only sharing information with your friends, and not with the public.
Sullivan also recommends creating separate email addresses for your personal communication and everything else. For example, you might use a throwaway email address for news websites that make you register with a user name and password, or for retailers who want to send you coupons.