@iEllaLouise - If your laptop has an HDMI port (you'll need to get an HDMI cable that is long enough) and if your TV has HDMI port available, you just connect them together. HDMI is bigger than a USB port. Not all laptops have them
There is wireless technology I'm not really familiar with, an iPhone or other device can stream movies and pix to a TV that has the same technology. This is out of my scope. Igazor and Phoebe will likely be much more helpful.
I'm just taking a break (from learning Gwent for another game). But you're at the right place to get help for things pertaining to TS3.
Like Phoebe, I recommend TomsHardware site for general tech questions.
http://www.tomshardware.com/forum/