Homonyms are words that sound the same, but are spelled differently and have different meanings and usages. This can be confusing sometimes as one must rely on context to figure out which word is meant or should be used. 

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Even native speakers sometimes fail to use the homonyms "there," "their," and "they're" correctly. Here is a quick review of which one is appropriate for which occasion. 

1) The word "there" is used to refer to a physical or abstract location.

When I flew in on the float plane, they were all there on the boat.

When I flew in on the float plane, they were all there on the boat.

Caption 4, Alaska Revealed - Endless Wave

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Also, it is commonly combined with a conjugation of “to be” or a modal verb to discuss the existence of something.

For everywhere we look, there is work to be done.

For everywhere we look, there is work to be done.

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I think there must be something wrong with me, Linus.

I think there must be something wrong with me, Linus.

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2) "Their" is a possessive adjective used before a noun when the subject is "they." With "their," we are speaking about something that belongs to two or more people.

What are their names? -Their names are Naya and Alex.

What are their names? -Their names are Naya and Alex.

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Their goal is a plan to finally help humanity reduce its carbon footprint.

Their goal is a plan to finally help humanity reduce its carbon footprint.

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3) "They’re" is a contraction of "they are" used to refer to two or more people in the third person. It is especially useful for shortening sentences in the present continuous tense.

I think they're nice.

I think they're nice.

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They're playing a game on the lawn.

They're playing a game on the lawn.

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Further Learning
Check out the examples above on Yabla English to get a better sense of the full context for the use of "there," "their," and "they're." Try to write a few sentences in which you use two or even all three of these words to solidify your understanding. An example would be: "They're not sure when they will get there. It depends on when their plane lands."

A personal pronoun is a word that substitutes for a noun representing people, animals or objects.

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The first person singular pronoun "I" usually refers to yourself (or the speaker). In the plural form it is "we."

I really am passionate about this.

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Well, we are very excited to have you with us!

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The second person pronoun "you" can be singular or plural and usually refers to the person or persons you are addressing.

What will you have for lunch?

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The third person pronoun refers to someone other than the person you are speaking to, and is "he" (male) or "she" (female) or "it" (object) in singular, "they" in plural:

She is elegant and we wish her luck this weekend.

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They thought it was a hoax.

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Further Learning
Read the personal pronoun article in English and in your native language to help you understand the basics. Write a simple sentence in your native language for each of the personal pronouns, then translate them to English. Search for some personal pronouns on Yabla English and see some different examples of how they are used in context.