Not everyone has a $3000 PC that can handle the latest games, in fact most people don't.
Not trying to sound like a snob, but I'm pretty sure you can build a decent modern PC on a $900~1000 budget.
All you really need to know is what electronics to get and from where. The rest is just knowing how to put them all together into one amazing machine.
Unless you are buying laptops, never buy a desktop computer. What you are paying for is simply a cool-looking casing and a logo of your choice. You can simply find much better and cheaper options yourself.