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Change your passwords now, and do so on a regular basis. Try to use a combination of upper and lowercase letters, numbers and symbols. Where possible, use two-factor authentication. This involves your usual password, plus a one-time code sent to you via text message or accessed through a dedicated authentication app like Google Authenticator and Authy for added security. Enlist a password manager. Services like 1Password and LastPass cost as little as US$3 per month and will remember all your passwords so you don’t have to, meaning you can make them as complex and weird as you like.
Our friends at Verified.org are a great resource for learning about online security, including their guide what to do after a data breach.