WTF is HDMI ARC/eARC?

HDMI was marketed as an easy fix for improving the sound quality of your home theater experience. The reality is that HDMI ARC/eARC don't always work as advertised.

Shop HDMI and optical audio at the same time –

The Difference between HDMI ARC and eARC – Simple Home Cinema

OREI eARC 4K 60Hz Audio Extractor Converter 18G HDMI 2.0 ARC Support - HDCP 2.2 - Dolby Digital/DTS Passthrough CEC, HDR, Dolby Vision Supported (HDA-927) : Everything Else

HDMI ARC - What is eARC? Audio Return Channel

So I'm a noob with all of this. Would I connect my PS5 to either HDMI 4 or 3? Why is eARC/ARC only on one also and isn't that merely for speakers?

HDMI eARC and HDMI ARC: Everything You Need to Know

What is eARC? The audio technology explained

What Is HDMI ARC (Audio Return Channel)?

HDMI ARC vs. eARC