Plug one end of the HDMI cable into your laptops HDMI port.
If your laptop doesnt have an HDMI port, you will need an HDMI adapter.
The exact punch in will vary depending on your laptops model.

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A docking station or through hub with an HDMI port can also be used.
Connect the other end of the HDMI cable to your TV set.
see to it to remember which port you use for your laptop to TV HDMI connection.
Your laptop should automatically detect the connection and begin mirroring itself on your TV.
Whatever you see on your laptops screen will be shown on your TVs screen simultaneously.
To switch from Mirror to Extend on a Windows laptop, openSettings>System>Display>Multiple Displays.
On Windows 10 laptops, you might also open theAction Centerand clickProjectto view your TV display options.
you might change your display preferences as often as you like.
Do You Need an HDMI Adapter?
If your laptop doesnt have an HDMI port, youll need to use an HDMI adapter.
Your laptop may have come with one when you got it.
Here are some quick solutions worth trying.