Things you need to know.
Never open any email attachments that you are unsure of. Make sure
you know who is sending the email and that you are expecting an
email from this person.
Make sure to keep your machine free of dust. Dust can increase
the temperature of your computer and cause it to overheat.
Update your operating system and applications with security updates.
Install an Anti-Virus program and be sure your program is running
with all of the current updates.
Practice using strong passwords. A strong password contains special
characters, lower-case and upper-case letters, and numbers. Try using
a password generator for extra strong passwords.
Protect your computer by installing a firewall. A firewall pevents
unauthorized users from accessing your computer.
Maintain your computer like you maintain your vehicle. Bring your PC
in for a tune-up annually.
Make a habit of backing up important files and folders.