HDMI port on Xbox Series One X

So o can connect the hdmi 2.1 to a regular 4 k 2.0 hdmi port but I will not get the full experience or
there will be like some xbox series xs that have different cables.

No, The Xbox Series X has a HDMI 2.1 port therefore it will always ship with a HDMI 2.1 cable,

[table][tr][td]Xbox Console HDMI Port[/td][td]HDMI Cable[/td][td]TV HDMI Port[/td][/tr][tr][td]Xbox Series X, HDMI 2.1[/td][td]HDMI 2.1[/td][td]HDMI 2.1 = 4K at 120hz[/td][/tr][tr][td][td][td][/tr][tr][td]Xbox Series X, HDMI 2.1[/td][td]HDMI 2.1[/td][td]HDMI 2.0 = 4K at 60hz[/td][/tr][/table]

"So o can connect the hdmi 2.1 to a regular 4 k 2.0 hdmi port but I will not get the full experience or there will be like some xbox series xs that have different cables."

Yes, you can connect a HDMI 2.1 cable to a HDMI 2.0 port on your TV, you'll just be limited to 4K at 60hz, which is no different to what it like to play on the Xbox One X right now,

[table][tr][td]Xbox Console HDMI Port[/td][td]HDMI Cable[/td][td]TV HDMI Port[/td][/tr][tr][td]Xbox One X, HDMI 2.0[/td][td]HDMI 2.0[/td][td]HDMI 2.0 = 4K at 60hz[/td][/tr][tr][td][td][td][/tr][tr][td]Xbox One X, HDMI 2.0[/td][td]HDMI 2.0[/td][td]HDMI 1.4 = 4K at 24hz to 30hz[/td][/tr][/table]

As long as you have HDMI 2.0 port on your TV you'll be fine to use the Xbox Series X, but if your wanting to experience 4K at 120hz, you'll need a TV or Gaming monitor that has HDMI 2.1 ports.

And what if I buy a cable will it work

The Xbox Series X will come with a HDMI 2.1 cable,

But whether you use a HDMI 2.1 cable or not, the HDMI port on the TV needs to be HDMI 2.1 to achieve the 120hz refresh rates at 4K.

using a HDMI 2.1 cable on a TV port with HDMI 2.0 will still only limit the Xbox Series X to 60hz refresh rates.

[table][tr][td]Xbox Console HDMI Port[/td][td]HDMI Cable[/td][td]TV HDMI Port[/td][/tr][tr][td]Xbox Series X, HDMI 2.1[/td][td]HDMI 2.1[/td][td]HDMI 2.1 = 4K at 120hz[/td][/tr][tr][td]Xbox Series X, HDMI 2.1[/td][td]HDMI 2.0[/td][td]HDMI 2.1 = 4K at 60hz[/td][/tr][tr][td]Xbox Series X, HDMI 2.1[/td][td]HDMI 2.1[/td][td]HDMI 2.0 = 4K at 60hz[/td][/tr][/table]

Yes mate the Xbox Series X will have an optical out port, 2 HDMI ports, 2 USB-C port, Ethernet

I had the same / similar issue with my old 4K 60hz none HDR / HDMI 2.0 monitor when watching movies and some times in games with the Series X,

As soon as i upgraded my monitor to a 4K 144hz monitor that has HDR / HDMI 2.1 ports, i no longer had this problem,

I'm not sure what the problem is, but my guess is that the HDMI 2.1 port on Series X doesn't play well with HDMI 2.0 port of monitors, or it's the Series X trying to force HDR on, even if the monitor does not have / support HDR and the HDR in Series X menu's is turned off.

well the xbox series x has one HDMI port, so you would need to either upgrade your audio kit, connect tv via optical if supported or by a hdmi to hdmi/optical splitter which would then not pass through any hdmi 2.1 features.