Tech expert Kurt “CyberGuy" Knutsson helps you ensure a smooth online experience with a reliable, secure home network setup.

You just plug one of two small boxes into an outlet near your router and connect it using an Ethernet cable, then you plug in the other into an outlet where you want to extend your internet to.

You try everything to connect your Roku device to Wi-Fi — restarting both the Roku and router, moving the router closer, and even tweaking the router's network settings — but you're still ...