The NBN provides a number of tips that help you make informed decisions about your home connection, so you can have the best possible internet set-up in your home and optimise services such at wifi.
View more on the NBN website here
Here is one tip for example:
Use an Ethernet cable to connect your high-definition television
Internet-enabled high-definition televisions need fast internet and consistent signal strength.
An Ethernet cable connection or a 5GHz Wi-Fi signal (with line-of-sight to the television) is highly recommended if you’re looking to achieve the best possible performance from your television. You can also consider using an Ethernet cable to connect to other fixed devices in your home, such as desktop computers and gaming consoles.
If you are having general NBN connection issues please read this article on NBN Connection Troubleshooting