"Its" refers to the possessive form of the pronoun "it." For example, when referring to a pair of shoes, you might say, "That's not its box."
Meanwhile, "it's" is the contraction for the words "it is" or "it has." For example, "It's (it is) going to be a fabulous night" or "It's (it has) been a fabulous night."
Use the preposition 'to' when indicating that there is movement from one place to another. In other words, the preposition 'to' with verbs such as drive, walk, go, hike, fly, sail, etc.
They is a subject pronoun, and them is an object pronoun.
1) They
They is used to refer to the subject of a clause. In other words, it usually represents the ‘doers’ of the action described by the verb, and usually refers back to two or more people or things that were mentioned earlier:
2) Them
Them is used to refer to the object of a clause. In other words, it usually represents the group of people or things that have ‘experienced’ the action described by the verb, and refers back to two or more people or things that were mentioned earlier: