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POwer supply unit (PSU) is the thing that takes current from your socket and transform it to amount that your sistem need.
Before choosing your PSU I hardly recomend to use psu calculators to anderstend how much power your buid will draw.
You can find tons of companies that produse PSUs so it's up to you what to take.

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GPU (graphic card) is like CPU but dedicated for one specific task: it takes your data and buid images/video from it.
Yes, most of CPUs can do it too? but it does it slower and worser? because it should do oter tasks at the same time.
So if you want to game, work wiht graphic or 3d you must have one.
And again there are 2 main manufacturer of consumer type GPUs: Nvidia and AMD. And here I'm fully for Nvidia because they have wide variety of csards for all wallets and all tasks.

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If you take really powerfull cpu you need to think about cooling it.
There are 2 tipes of CPU coolers: air and water. Both of them is good, but i prefer warer for its better heat dissipation and lower noize level.

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It's the main components of your build.
It runs all programs, reads and transfer data from your HDD/SSD and do all types of usefull things. Different CPUs is good in defferent fields of use like gaming, phisik reserches,video editing and more...
There are 2 main manufacturer of consumer type processors: Intel and AMD.
Couple years ago I'd say that Intel is the best, but now AMD reduse gap really much. So it's up to you wich prosser from wich company you should take

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PC is great!
It can help you in lots of activites.
And today I'll tell from what components consist computer)))