Delete hiberfil.sys on Windows 8

https://www.pcastuces.com/pratique/windows/fichier_hiberfil/page1.htm

Hello,

My C drive is 107 GB and I only have 3.3 GB left! I'm running Windows 8.
Recently, with this same remaining approximate 3 GB, I had to transfer my WOW game to the D drive, and now I can't use it, but after doing this, I had about 20 GB available. However, the available space has drastically dropped back to these 3.3 GB! Why this increase, since I already had the hiberfil file! Now, I can't move GW to the D either, because I wouldn't be able to play it anymore!

So, having read the above, I tried the prescribed maneuver, and it changed things a bit, I now have 9.64 GB available! But it seemed to me that Hiberfil took at least 16 GB... so only 6 should have been freed. Weird.. in any case, I can't find Hiberfil anymore, so thank you for the maneuver, my C drive is already a little better!

There are still lots of things on my PC that correspond to nothing I know or that I've put there.. so I'm hesitant to delete anything :(
(For example, what is another large file: swapfile.sys??? which takes up 232144 KB)

Thanks anyway for the maneuver to delete Hiberfil!

Oh, does anyone know how to transfer part of the D or E drives to C??

Thanks in advance
Aurisane