Question about installing games on the hard disk

[KAWASAKIZ]

Hello guys,

today after a big backup, i decided to reset to factory settings my pc.
i did it to clean out some shit, and try to make it a bit faster.
i'm running on win10 64. as the title says i'm here asking:
where do i install games (like bf4, cod, gta v)?
some of my friends (that are way more expert than me) told me to don't install them on the O.S. hard disk (disk C),
where are situated the systems files and the O.S, because the computer gets slower.
Should i install them on disk D?
or make a partition?

i really need help, thanks.
(tell me everything you know about how to keep better an hard disk)

[Wahlamt]

Install them where you have space. I have my OS on C:\ and other applications that I couldn't choose where to install. But I only have a 120GB SSD as C:\, so therefor I install all my programs on D:\ where I have a 500GB HDD.

[KAWASAKIZ]

oh okeh, thanks