GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Basic Level

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I am going through all the different files and folders in Gimp

Should there be any Py files in Plugins? or text files?

I have a Gmic file in my Scripts folder,and abevel reflect logo(Application) as well
also some texts documents, Should I remove them or send them to other folders?

Thanks!

in my plug-ins folder i only have .dll, .py and .exe files.
in my scripts folder i only have .scm files.

As Tran says. Python scripts are considered plugins in the GIMP.

Does anyone know what a INIT file is, and where it should go?

not sure about INIT files but just in case you should just move it to a folder called backup or something that way if anything goes wrong you still have it but i doubt you need it as I don't have any init files in those folders of mine.

The plug-ins folder is used primarily to hold the executable files for any plugins which you have installed into your personal Gimp "profile", but it may also contain supporting files or even sub-folders for those plug-ins.
On Windows, the executable files for C plugins will be .exe plus any required .dll files.
Python plug-ins are .py files.
(And if you had any Perl or Ruby plug-ins, they would also be installed here as .pl or .rb files.)
Various plugins do use supporting image and/or text files and a few (such as indexprint and mathmap) come with complete sub-folders. Deleting such files may well prevent the plugin working.

The scripts folder is used primarily to hold Script-Fu scripts, which are .scm files, but again may also contain supporting files or even sub-folders for those scripts.
The .gmic file is probably Gmic-Logos-presets.gmic which I created for Graechan in this thread: viewtopic.php?f=9&t=11544 to support the Gmic-Logos script. And, yes, it is required.

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Edit:
From your last question ("Does anyone know what a INIT file is, and where it should go?") it sounds like you are trying to sort files on the basis of file type to keep things "tidy" - that is a recipe for disaster, especially on Windoze!
Files must be installed where they belong and where the software expects to find them.
What INIT file? Without knowing the precise name of the file, we cannot tell where it should go (if at all).

Please show the actual names of these files rather than just citing the file type.
If you do delete required files you could very well find yourself spending many hours trying to repair the damage the next time you try to use these plugins or scripts.

Perhaps you should just post a complete of the files in each folder (plug-ins and scripts) and then we can better advise which are required and which not.