Showing a webpart only on the backend/cms site

I would probably recommend you use a custom macro, then you can add your own logic to decide if the webpart should show or not.

See the documentation here.

You could have an AppSetting in the web.config to dictate which environment the site is running on, and your custom macro could check this is set to prod.

The problem is that I'm completly new with cms/k#/kentico and I have no idea what is everything.

So i was trying to get an easy solution where I can just do something from the webpart itself (like if I didn't had access the the code or custom stuff). A macro that already exist that gets the path of your browser or that knows if you are in administration mode or not.

If there's really no other easy solution, I'll have lot of work to learn haha

If you're only wanting the webpart to appear in the backend and not the frontend, you can use the ViewMode macro like this:

{% PortalContext.ViewMode == "Edit" #%}

If you're wanting to show the webpart based on different environments (e.g. for production) then you could utilise the machine name macro (assuming they are on different machines):

{% SystemContext.MachineName == "PRODUCTION" %}