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Use words that are not directly related to each other, along with numbers and symbols.
Many websites offer the option to use your Facebook or Google login to access their site. While convenient, this poses a privacy risk. If one account is compromised, then other linked accounts may also be at risk.
Look for an address that starts with https: rather than http: Also look out for the padlock symbol next to the address bar.
Use your phone to verify your identity, an option on many large websites.
This will store your passwords in an encrypted form and help you generate secure random passwords.
Social media accounts are regularly hacked. Look out for language or content that does not sound like something your friend would post.
Are you sharing your location when you tweet? Do you want the general public to know your date of birth? Utilise privacy settings to only share what you are comfortable to do so.
If you don't know the person, don't accept their request. It could be a fake account, or part of a scam. Once you are friends they can see more of your data.
Ensure you have a secure connection you can trust whenever giving out any of your banking or payment details.
Keep your antivirus software up to date. Often free software is as good as many paid versions.