Just remember that a wireless router can pose a HUGE threat to your system security, but it doesn't have to. Please take the necessary time to understand the possible consequences of an insecure WIFI network and understand what steps you can take to prevent that. Modern WIFI hardware is generally plug-&-play but it's typically NOT pre-configured with the most secure settings and they use default passwords which every cyber-crook knows by heart.
There is loads of information available online about this and the documentation which is supplied with most WIFI routers typically covers it pretty well too, so this is definitely a case where reading the instructions carefully before you even power up the equipment is a real good idea.
Pete