Create a log of all of the data that is important to you
Separate networks used by computers and IoT devices
Check firewall
Enable WiFi Protected Access and WPA2 encryption.
Check for firmware updates to your WiFi router
Rename your home WiFi network
Review and restrict your online footprint
Use a secure browser w/out trackers e.g brave
Review the devices attached to your home network
Change default passwords on smart devices
Change default router admin password
Use a VPN
Two step verification
Manual backup to separate device, kept elsewhere
Automatic cloud backups
Play protect (for Android devices)
Find my device (for Apple devices)
Check privacy settings for apps
Check what access your apps have
Use a password manager
Save passwords in your browser
Check antivirus is activated
Install antivirus - particularly on mobile
Set devices to update software automatically
Check all your software is up to date
Screen to auto-lock after a period of inactivity
Strong passwords
Require a passcode to access your device