Your Apple ID or Google account isn't just for email, it's usually connected to your photos, your contacts, your location, and often your payment details too. It's one of the highest-value targets on your phone, which makes it worth a few minutes of attention.
Check your recovery details
Make sure the recovery email address and phone number on the account are current ones you actually check. If a recovery option is outdated, it becomes a weak point rather than a safety net.
Check what's signed in
Both Apple and Google let you see a list of devices currently signed into your account. If anything on the list isn't yours, or is a device you replaced years ago, remove it.
A five-minute check now is far easier than untangling a compromised account later.
Turn on two-step verification if it isn't already on
Both platforms support an extra verification step beyond your password. If you haven't already, this is worth doing straight after checking your recovery details and signed-in devices.
Where to find these settings
Apple's official support site and Google's official support site both walk through exactly where to find each of these settings for your specific device.
Straight from the source
Official Apple and Google security settings are linked on the Free Resources page.