"Most newer TVs come with three or four HDMI ports, and on the surface, they all look identical. They all have the same shape and work with the same HDMI cable, but not every port supports the same features. Choosing the wrong one can leave your PS5 stuck at 60Hz, your soundbar silent, or your PC unable to output at a high refresh rate."
"For example, an HDMI 2.0 port supports 4K at 60Hz, HDR, and ARC audio, making it good for streaming media players and cable boxes. Meanwhile, an HDMI 2.1 port supports 4K at 120Hz (or 8K at 60Hz), VRR, ALLM, and eARC, which is great for next-generation consoles like the PS5. HDMI 2.1 can sometimes reach 4K at 240Hz with Display Stream Compression (DSC)."
"If you happen to plug into the wrong HDMI port, nothing will break, but you will not get full performance or sound. Then there is usually an ARC / eARC port, or audio return channel. It looks like an HDMI port, but it can send audio back out to a soundbar or AV receiver. ARC supports standard Dolby Digital 5.1, while eARC supports uncompressed Dolby Atmos and DTS:X."
Most modern TVs include multiple HDMI ports that look identical but support different feature sets and bandwidths. Using a lower-capacity port can limit resolution, refresh rate, HDR, VRR, and audio capabilities without damaging devices. HDMI 2.0 typically supports 4K at 60Hz, HDR, and ARC audio; HDMI 2.1 adds 4K at 120Hz (or 8K at 60Hz), VRR, ALLM, eARC, and sometimes 4K at 240Hz with DSC. ARC sends audio to a soundbar or AV receiver and supports Dolby Digital 5.1; eARC supports uncompressed Dolby Atmos and DTS:X. TV HDMI ports are often labeled to identify features.
Read at ZDNET
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