Your Google account (if you use Android or Gmail) and your Apple ID (if you use an iPhone) are the keys to almost everything you do online. If you lose access to them, recovering is a nightmare. If criminals get into them, they can reset every other password you have.
The single best thing you can do today is add a recovery phone number and backup email address to both accounts. This takes five minutes and means that if you get locked out — or if someone tries to take over your account — you have a way back in.
For Google: Go to myaccount.google.com → Security → Ways we can verify it's you.
For Apple: Go to Settings → [Your Name] → Password & Security → Recovery Contact.
While you're there, check the "Devices" or "Where you're signed in" section of both accounts and remove any devices you don't recognise. This is how you check whether anyone else is already logged into your account.
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