If your devices only support up to 4K at 60Hz, a "premium high-speed" HDMI cable (18Gbps, HDMI 2.0) is perfectly fine. Again, just avoid really old or thin cables. Early HDMI cables (HDMI 1.4 or older ...
It's easy to find yourself with more sources for your TV than it has inputs. Most TVs just have three or four HDMI connections, so if you have a PlayStation, Xbox and cable/satellite box, what happens ...
HDMI 2.1 has several aces up its sleeve, but DP still rules PC gaming ...