[SOLVED] SWAPFILE : location - Where to place linux swapfile in the system tree ?

Hi!

Maybe, this is very silly and very answered question,
but I didn't found clear, simple answer to this question.

For now, I've only found references to :

/var/opt/ltsp/swapfiles

in https://tldp.org/LDP/Linux-Filesystem-Hierarchy

Here (in this forum)
I've read something about : /swapfile
this not references but simple forum posts.

So I ask gurus about,
if ever there is a best place for my swapfile in GNU-Linux (Debian)

Thanks for advises.