Your laptop will either connect via a USB-C docking cable, or an HDMI cable. Take a look on the desk for either type of cable.
Plug that cable in to the side of your laptop to connect the projector or TV to the laptop.
You may find the laptop is on "Duplicate" or "extend" mode. Press the Windows button and P at the same time to change this behaviour to your preferred option.
The USB-C connector looks like this:
The HDMI connector looks like this: