Help me choose components for the pc?

desirable for games such as The Witcher 3 at 1920 1080 resolution at max settings

percent i 5 6500 or i5 6400
video card or gtx 970 or gtx 1060 from which manufacturer?
mate I don’t know what?

PnavI, if specifically for this card, a Core i5-6400 is enough. The video card is definitely a GTX 1060 and only with six gigabytes.

I won't say anything about the MP for Skylake, because I don't follow them.

and from which brand will you advise and to fit into the case and which motherboard to buy

PnavI
in computers, I was given a zero case, the assembly of the system in the region of 55-60 tons

Ahaha lol. Did you give it for the first of September? They presented an empty case, and even designed primarily for liquid cooling systems, a person who is a zero in iron.

PnavI, versions from MSI or ASUS. They say the GTX 1060 from Palit is also good, but I don't really trust this manufacturer.

the body itself was presented by a friend, he simply did not give him the size

PnavI
Friend fumbles in the gland? Or is it also a complete zero?

yes he is fumbling but he is abroad now

PnavI
If you have 60 kilos, then be sure to find some acquaintance or acquaintance of acquaintances who fumble. Ask them to pick them up and collect them, for a reasonable fee. Good luck.

ATP will look for

Processor: Intel Core i5-6400
Cooler: DeepCool GAMMAXX 300
Motherboard: GIGABYTE GA-H110N
Video card: Gigabyte GeForce GTX 1060 G1 GAMING
RAM: Corsair Vengeance LPX CL 2x8GB
Hard disk: 2 TB WD Blue
Power supply: Cougar STX550 550W
drive (optional): LiteOn iHAS120 / 122/124
This config will be productive and will allow you to run all modern games at maximum settings. It is a pity that the case is small and only "chopped off" mini ITX motherboards fit into it