The most important internet safety rule is using a unique password with two-factor authentication on every account, which stops one leaked password…
Do give every important account its own long password, ideally 12 or more characters mixing uppercase, lowercase, numbers, and symbols, and switch on two-factor authentication.
Do keep your operating system, browser, and apps current, and enable automatic updates so the decision is made for you.
Do be deliberate about what you post on social media and public forums.
Do open the privacy settings on your accounts and tighten who can see your posts, profile, photos, and contact info.
Read the complete breakdown, fixes and what happens next.