Question

Объясните мне пожалуйста,когда ставится it`s,а когда its и в чем их различия?

Answer 1

it's - это краткая форма от it is
Например It's a book/ - Это книга.

its - это притяжательное местоимение
This is a dog. (Это пёс.) 
Its name is Rex. (Его имя Рэкс.)

Answer 2

It's and its are two different words with different meanings and uses in the English language.

It's is a contraction of "it is" or "it has." For example, "It's raining outside" is the contraction of "It is raining outside."

Its is a possessive form of the pronoun "it." It is used to show that something belongs to or is associated with a thing previously mentioned. For example, "The dog chased its tail" shows that the tail belongs to the dog.

So, the main difference between the two is that it's is a contraction for "it is" or "it has," while its is a possessive form of the pronoun "it." Remembering this difference will help you use the correct form in your writing and speaking.