Does anyone know a good monitor to buy for a Xbox series s

You've stated twice in your post about a PC. What exactly is it you're looking for? A PC or a Monitor?

If it's just a monitor you're after, don't make the mistake of buying 'any monitor' that fits your budget and hope that it works, because as SwordofWhedon has already stated, many monitors have compatibility issues with consoles. Just because a display says it does 144Hz, doesn't mean you'll get 120Hz on the Xbox. Many monitors, especially older models, have their own custom timings that don't conform to the VESA standard that the Xbox expects.

Series S is largely a 1080P console with some games running at 1440P. If you connect a Series S to a 4K display it won't look great. Series X looks good on both 1080P and 4K displays.

https://www.rtings.com/monitor/reviews/best/xbox-series-x#recommendation_264254

So, we finally got to see the next gen "little brother" Series S. It's kept to a design not far from our current One S, and i my opinion looks pretty good. Properly not one that i am going to pick up. I will definitely go Series X all the way.
But a nice cost efficient alternative and a great entry model for new xbox players.

What are peoples thoughts ? and are you thinking about picking it up ?

The way i see it, i don't see the Series S as an entry model, it depends on what the resolution of TV / Monitor is being used, because the Xbox Series X is more aimed at 4K gaming and the Xbox Series S is more aimed at 1080p / 1440p gaming,

For someone who does not have / own or does not plan to upgrade to a 4K TV / Monitor, then the Series S is perfect choice to get and will save you money by not paying for something that you'll never get to see or use the full potential of the Series X,

It make no sense to me why anyone would buy a Series X just to play at 1080p, but there will be people out there who will do just that, to me, that's just wasted money in my opinion,

My thoughts are...

If your gaming at 4K, go with the Xbox Series X,

If your gaming at 1080p / 1440p, go with the Xbox Series S,

I have a 4K TV and a 4K Gaming Monitor so for me, I'm getting the Xbox Series X.

You've stated twice in your post about a PC. What exactly is it you're looking for? A PC or a Monitor?

If it's just a monitor you're after, don't make the mistake of buying 'any monitor' that fits your budget and hope that it works, because as SwordofWhedon has already stated, many monitors have compatibility issues with consoles. Just because a display says it does 144Hz, doesn't mean you'll get 120Hz on the Xbox. Many monitors, especially older models, have their own custom timings that don't conform to the VESA standard that the Xbox expects.

Series S is largely a 1080P console with some games running at 1440P. If you connect a Series S to a 4K display it won't look great. Series X looks good on both 1080P and 4K displays.

https://www.rtings.com/monitor/reviews/best/xbox-series-x#recommendation_264254

I apologize for not making my point clear earlier. I have an Xbox One S console and am looking for a monitor to connect it to in order to play FIFA 23. I am willing to spend a reasonable amount on a monitor, but I do not want it to be too expensive. I would like the monitor to be suitable for use with an Xbox Series S/X, in case I decide to upgrade in the future. I am seeking recommendations for monitors that are compatible with consoles and do not have any issues. Thank you.

I would like to inquire about the recommended budget monitor that costs only $300. Would this monitor be suitable for use with an Xbox Series S/X if I were to upgrade in the future?

Even if you get one, there is no guarantee such an adaptor will work. The Xbox Series X and S consoles expect the display to output to an exact timing. It's likely that the DVI port has a different timing (like 119.88Hz or something like that). If the monitor does not not output the correct timing that the Xbox expects, it will not work, no matter what adaptor you buy. This is a display issue, not a console one.

It must be a pretty old monitor if it only has DVI and HDMI. There are plenty of gaming monitors that support the Series X|S, it might be a time to buy a new one.

Just because a display is 144Hz, does not mean it will automatically work on an Xbox console. Unlike the Xbox console, PC graphics cards don't need to have exact timings.

In that case I highly recommend you see the monitor/TV in action with the console. That way you can verify that the monitor does support 120Hz on the Series X.

The Rtings website's reviews of Series X compatible monitors is a great way to start your search. These are professional TV/monitor reviewers, they test everything!