I wouldn't go with that prebuilt, it doesn't have a graphics card, and you probably can't add one easily because the power supply probably isn't beefy enough. For $1000USD I think you can make a better gaming computer. Also Dell/HP prebuilts suck because the parts are non-standard, so if you want to replace a motherboard or power supply, you are at the mercy of buying only Dell or HP parts.

The new graphics card market kinda sucks right now, and used cards you have to be careful to not buy an improperly treated mining card.

If you want to find a build that makes sense, look up something like "2023 PC Build". It's hard to pick parts that don't hold each other back (if you spend $1000 on a graphics card (GPU) and $100 on a CPU, obviously you won't get the full performance of the GPU).

You probably want 16GB of ram. Your graphics card depends on your budget, and then to choose a processor you look up something like "2023 *graphics *card PC build" to find a CPU that makes sense for the GPU.

Your monitor also matters, because depending on if you want 1080p, 1440p or 4k resolution, it will change how much you spend on GPU.

The motherboard isn't super important unless you need certain features, all that matters is it works for the CPU you choose. You don't need to worry about overclocking probably, but you do need to worry about if wifi/Bluetooth is included on the motherboard.

The motherboard size you need depends on the case size. ATX, mATX and ITX are the sizes of motherboard from big to small, probably don't bother with ITX because you pay more to get small parts that fit in small cases.

PCpart picker makes sure your CPU and motherboard are compatible, and it tell you how big of a power supply you need based on the CPU and GPU.