Question Gigabyte Z390D compatible ssd?

There's no such thing as a compatible SSD in the crude sense, you can use almost any SSD with a motherboard provided it has the slots (the lack of which is pretty rare), if you mean a m.2 SSD, you can insert any usual m.2 2280 or slightly longer (and rarer) m.2 22110
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By the screw slots (around number 11) i suppose you can go with the usual m.2 2280 SSD's

And then, there's always the choice of a SATA SSD as well, though that one depends on whether you have space for them in your chassis