English Grammar Rules & Mistakes: Learn All of the Essentials: Writing, Speaking, Literature and Punctuation Rules Complete with 10 Key Skills and Over 200 Common Error Examples

Their is used as a possessive word. It means belonging to someone or to
them. On the other hand, there is used to mean position, state, etc. 

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Example
Incorrect:
The man was killed over their.
These are there books.
Correct: 
The man was killed over there.
These are their books.
Confusion with Your/You’re
The same error happens as for their/there explained earlier. Just like “their,”
your is used as a possessive word, while you’re is simply derived from you
are (like an abbreviation). 
Incorrect:
Your at the top of you’re career today because you have worked
hard in the past.
Your innocent, and I know that.
Correct: 
You’re at the top of your career today because you have worked
hard in the past.
You’re innocent, and I know that.
Remember: To know if you are making the right sentences with the words,
ensure you cross-check by replacing the words alternatively. To a large
extent, by alternating the words, you’re good to go. Whether you want to use
their, there, your or you’re, an alternation of the polar word (e.g., your for
you’re) will be good for you to determine which is correct to use.
Confusion with Raw/Roar
These two words are very identical in pronunciation just like others. The
distinctive difference is that raw refers to the unprocessed state of something,
i.e., uncooked. It may also mean “not organized or something new.” Roar is
referred to as a loud noise made by a lion or a machine engine. 
Incorrect: The statistical table was made using roar data.
The guy could raw to make the room shake.

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Correct: 
The statistical table was made using raw data.
The guy could roar to make the room shake.
Confusion with Dearth/Death