Keeping safe on the internet

Enable or block firewall access — You can control which programs can access the network. This helps to keep your computer secure.
Commonly-used network ports — You need to specify the right network port to enable/disable network access for a program with your firewall.
Do I need anti-virus software? — There are few Linux viruses, so you probably don’t need anti-virus software.
Do I need to scan my emails for viruses? — Viruses are unlikely to infect your computer, but could infect the computers of people you email.