Here’s a classic tip for anyone who might occasionally get tripped up – courtesy of Grammar-Monster.
It’s is short for it is or it has. This is a 100% rule. It cannot be used for anything else. If you cannot expand it’s to it is or it has, then it is wrong.
Its is like his and her.
Visit the Grammar-Monster post for a good list of examples and even a quiz! And make sure you check out the example with frogs – the best frog-related trivia we’ve ever seen.