I’ve wanted to know the difference between these two Kanji, both mean ‘floor’ but they have different uses.
I think I might have a slight idea that maybe 階 (かい) means like a building floor/level and 床 (ゆか) just means any floor or maybe a natural floor maybe.
I just reached lv 12 and I need help plz!
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You’ve got it. 3rd floor would use Kai. Yuka is the floor
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The context sentences make it pretty clear. 
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In cases like that jisho is your friend to get the secondary concepts 
床 (bed, counter for beds, floor, padding, tatami)
vs
階 (storey, stair, counter for storeys of a building)
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床 is a flat surface in a house where you walk on, or where you lay down to sleep.
階 is a volume in a house limited downside by a floor and upside by a ceiling.
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