Connecting a standard or “non-smart” TV to the internet requires connecting a Wi-Fi capable device to your TV. These include gaming consoles (PlayStation 3 and Xbox 360 or above), streaming boxes and sticks, and newer Blu-ray players.
Or you can use an HDMI cable to connect a laptop or smartphone to your TV, which will mirror your display. This may require purchasing a USB C-to-HDMI or USB micro-to-HDMI cable.