To cast to your Roku TV from your laptop, you'll need to make sure that both devices are connected to the same Wi-Fi network. Once you've done that, you can use the Roku app on your laptop to mirror your screen to your TV, or use a third-party app like Chrome or Firefox to cast specific content. It's a pretty straightforward process, and I'll walk you through it step by step.
The first thing you'll need to do is download and install the Roku app on your laptop, which is available for both Windows and Mac. From there, you can follow the in-app instructions to connect your laptop to your Roku TV, which should only take a few minutes. Once you're connected, you can start casting your laptop's screen to your TV, and enjoy your favorite content on the big screen.