به کانون زبان پاسارگاد خوش آمدید.

its / it's

its: possessive determiner similar to 'my' or 'your'

Examples:

Its color is red.
The dog didn't eat all of its food.

it's: Short form of 'it is' or 'it has'

Examples:

(it is) It's difficult to understand him.
(it has) It's been a long time since I had a beer.