Be sure to purchase a USB-C cable and not a Thunderbolt 3.
If you have a MacBook produced after 2015 and it has a single pill-shaped port on the side, your MacBook supports a USB-C connection, but not Thunderbolt 3 connection. You can use a Thunderbolt 3 or USB-C cable in any one of the output ports. 
MacBooks that support Thunderbolt 3 have multiple output ports on them.
Both Thunderbolt 3 and USB-C ports have a small pill-shaped port.
If you have a MacBook Pro or MacBook Air produced in 2016 or later, your MacBook supports both Thunderbolt 3 and USB-C output ports. Depending on the year your MacBook was produced and its make and model, your MacBook may use either a Thunderbolt 3, USB-C, Thunderbolt, Thunderbolt 2, Mini DisplayPort, HDMI port, or USB-A port. No worries, it’s easy to do and the back of your TV probably has a dual RCA-style “audio in” jack you can use with a simple audio splitter from Radio Shack or similar to accomplish the same goal.Determine which video outputs your MacBook has. If yours doesn’t show this then you might have an older MacBook or other Apple Mac product and might then need to have a separate audio cable hooked up to your TV. Look for your Audio (Built In) and make sure that there’s an HDMI / DIsplayPort Output option, like so: Now, if it’s still not working, launch the “System Information” application that you’ll find in “Applications” > “Utilities”. Easy once you realize that it’s not an automatic switcher. Once I’ve switched the output audio, it should automatically be feeding audio to the TV so a quick test with the movie trailer should work great, audio and video both. It just means that I’ll have to adjust the volume on the TV itself rather than on the computer. “The selected device has no output controls”. 
I click on “Samsung” and get an interesting warning message at the bottom: See the second choice down, however? That’s what we want, for the Samsung HDTV we’ve plugged into: The default audio output is “Internal Speakers”, so it’s no surprise that while we’re seeing the video on the TV, the audio is still being piped out of my MacBook Pro speakers. To switch it, choose System Preferences off the Apple menu, then look for “Sound”: It all looks good, but the audio is coming out of my computer even as the video is being fed to the HDTV.
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