a dumb question but I use Gimp only since February 2018 :
In some threads on Gimpchat, it is about the "profile" of Gimp.
I have portable Gimp, which folder is the profile?

What is my “GIMP profile” and where do I find it?
The “GIMP profile” is a directory/folder (actually a directory tree) where GIMP keeps information that pertains to you, the user:

your windows and dialogs setup
your settings and presets for some tools
your keyboard shortcuts
your brushes, gradients, palettes, patterns, fonts, scripts, plugins and brush dynamics (as opposed to those installed for the benefits of all users).
Usually is found in the path (for Windows) user name (name of your computer), App data, Roaming, Gimp, 2.10

Check this page out, https://www.gimp.org/tutorials/GIMPProfile/
Replace 2.10 for 2.8 if you use 2.10

sallyanne

As the version is portable, Gimp is not present in C: \ Users \ xxxxx \ AppData \ Roaming

if I read the link correctly, the "preferences" folder is the profile?

IMHO that's it.

Dinasset