IT'S VS ITS
It's is a contraction of it is.
"It's nice to meet you."
Its shows possession/relation.
The dog shook its head.
An easy way to check if you should use its or it's is to separate the contraction to see if it still makes sense as the two words.
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Grammatically Correct
RandomRules of writing so you are grammatically correct because it's one if my pet peeves. This is to educate and assist people in perfecting their writing and because school doesn't always teach us what we want to know.