That's not a particularly good idea if you're new to PCs as there's a decent chance you'll get scammed if you don't know what you're looking for. See this video:
Except some of the PCs are a lot newer than what you're talking about. OP mentioned a 11th gen PC earlier. While that's not exactly new, it's still got plenty of life left in it for the games that OP wants to play.
The other problem is, if my pc runs into a problem, I'm not a technician. There are no PC technician shops nearby and it will take a long drive to reach there. Moreover, PC fix shops charge a very high price for issue fixes here. The reviews for Daseen say its alright, but the other problem here is that space, issues, and the fact that I'm a goner if anything wrong happens to my PC, considering the price. I think I should go for the mini, learn about pcs for 2 years or so, and then, once I'm certain I can take care of a PC, I might buy one. How's that?
also, if I do have to buy a mini PC, I'm still asking everyone to send recommendations (in 1850 dhs)
I can't build my own PC yet, and I also don't know how to modify a Dell Optiplex. I don't trust eBay either, which adds to the challenges I'm facing. The best option for me is Amazon, and I’m trying to remain positive about it. I can consider prebuilt systems, preferably ITX ones since I have limited space. I also find mini PCs to be appealing because they are small and reliable, and some of them offer good performance. I'm looking for powerful and budget-friendly options, and I need assistance with my search.
1) See it demonstrated is simple. Ask for them to install any one of a few benchmarking tools, and run something simple. Check against results on the internet to make sure it's in the right ballpark, then meet up at a library or similar where you can have them power the thing on and demonstrate the functionality. The video about scamming is basically trusting people and how with a lot of effort they can lie. Buying on Amazon is literally no better.
2) There are plenty of newer PCs. The budget is usually the sticking point, and I highlighted one. I then said to get a refurb and install a new GPU...which is the best option for literally anybody who can turn a screwdriver.
3) Building a PC isn't hard...but I understand the issue. Let me start with stating that usually the build fee is around $100 so that whomever made it makes a profit. Your mileage on that exact number may vary. That said, $400 for the hardware to a computer today is a really awful number when a quarter of that also needs to cover an OS and Office Suite. $300 buys a moderate 1080p video card nowadays...so you can spend a ton of effort to try and find all of the sweet spots for cost...and you're still going to be in a bad place. This is why people build their own...
4) I recommended everything with a proper amount of review because we are about to end the 4000 series GPUs, introduce Battlemage, get the 8800, and Intel is officially competing with AMD just slightly out of this pricing bracket, so you are looking for 1-2 generation old stuff as the absolute maximum you could purchase decently new.
5) Did you miss the bit about the mining and 580/590 cards? I ask because the "lying" about this, or cheating, or whatever you want to call it is not new or special. It is also not a lie. You sell things as-is, and there's no guarantee or warranty unless explicitly stated. Heck, buying from Amazon isn't even a guarantee, when the sellers have no explicit warranty. This is why people are generally recommended to build their own...because it's not like a 5+ year old card with no history is going to have any warranty honored against it.
6) Final point, the modifications required to add a new GPU are trivial, assuming you buy a low end card (Higher end might require multiple connectors or one of the new high power ones). Boot PC, run DDU (video driver cleaner, available on this website), power down system, open case, identify existing GPU, or open PCI-e x16 slot, remove panels from back-plane of PC so the bits of the GPU will be visible, slot GPU into the PCI-e slot (push down gently until connector snaps retention bracket into place), connect power (either x6, x8, or x6 to SATA connector), close case, restart computer, install new GPU driver package. I've had people do this over the phone with me, and the largest time sink is the driver cleaner. Please, don't let this be an obstacle to getting what you want. Likewise, don't pay the premium "gaming" price tag. Getting worse hardware, for a single word being attached to the product description, is something that is morally reprehensible.