There are lots of caveats and specifics to digest from this guide. Here are some of the top takeaways to help you distill this info.

1. Check the packaging for HDMI type markings

To find the category or type of HDMI cable you are looking for, take a look at the packaging before purchasing the cable. The packaging of the cable should have the certification you are looking for. If the box does not have any certification or marking, it's probably best to leave it alone.

2. Don't buy overly expensive cables

Even if you're looking for an HDMI 2.1 cable you do not need to spend more than ~$10-$15. Cables more expensive than this are generally not worth it.

3. Buy your video sources and displays before buying your cables

HDMI cables should be the last part of our journey when considering any home entertainment setup. Once you have the equipment you want, use the specs on that equipment to determine what cables you need.

4. Don't use cables that are over 10 feet (unless they are active)

HDMI cables are not designed to work over longer distances than 10 feet due to their lack of power source. If you need a cable longer than 10 feet, use an active (powered) cable or an extender (covered in Finding the Right Cable or Adapter for You section)

5. If the screen is going black or has any irregulaties in the picture, try swapping the cable out

HDMI cables can often fail due to wear and tear. 

6. HDMI cables are backward compatible

HDMI cables whether 2.1 or 1.3 will work with any device. See the caveat below.

7. HDMI cables are like water spouts

If you use an HDMI 2.1 cable with a TV that only has 1080p capacity, it will still work but you won't be able to access the fidelity that the cable can provide. To access the 4K power of the HDMI 2.1 cable, you need both a video device and a display that are compatible.

8. When in doubt check this HDMI graphic out!

That is everything you could possibly want to know about HDMI cables. Huzzah!