Answered
Why is it filled if it's on none?
Why is my grid which I created with the rectagular grid tool filled if it's on none?

Why is my grid which I created with the rectagular grid tool filled if it's on none?

I see that when placed in my 'mask' layer this is what happens, it gets a fill suddenly.
You need to drill down further into the layers panel and into the objects.
Here's how to use the Appearance panel: https://youtu.be/zXvRbN03MzQ
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