When I want to use it as a 2nd monitor, I use an HDMI cable to connect my ASUS laptop to the Insignia Smart TV. The TV has 3 HDMI ports. I use one for a cable hookup and one for the laptop when I connect it. Using Windows 10, you have multiple options under PROJECT - to use the tv screen as a mirror of the laptop screen, to use it to extend the laptop screen, or to use it as the primary monitor. I normally mirror, but using the extend option does give you lots more room for open applications. If you don't have an HDMI port on your laptop, you can find some type of connector to convert another type of port to an HDMI port. If you have a USB-C port on the laptop (most recent models include at least one), there are a huge number of plug in hubs available to give you an HDMI port for the laptop (as well as miscellaneous other ports, depending on the hub you purchase).
Insignia™ - 6' HDMI Cable
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