Setup automatic backups. If you lose everything but can get it all back…you haven’t lost everything.
Operating System updates are automatic or notify. Most security breaches are because someone didn’t bother to patch their system.
Antivirus program should be run automatically.
Firewall should be running (it probably is default).
Sometimes run a secondary anti-malware program (e.g. MalwareBytes or The Cleaner).
Never email your password. True Tech Support won’t need it and won’t ask for it.
Turn on the best WiFi security you can. In order of preference, WPA2, WPA, WEP