First and foremost, this is a serious guide as it annoys me and surely other players of this community.
They're/they are.
They are or for abbreviation they're. Again, they're is short for they are.
Here is a simple sentence on how to use the abbreviated they are.
Example;
On Friday morning, Teddy is going to attend his soccer match. They're going to win said his mother. ✔
It is correct because they're stands for they are. Nothing really to explain.
Example of what not to do;
So many people attended they're soccer match because they were going to win for sure.
Note; Did you see how they're was used incorrectly? It should have been replaced with their or there.
Their
Their means owning something/show possession.
Here is a simple sentence on how to use the word their.
Example;
No one has seen their soccer ball. ✔
It is correct as it is
their soccer ball. They own that particular soccer ball.
Example of what not to do;
Are we their yet?
That sentence is incorrect as their is showing possession over something. Do they own yet? I don't think so.
There
The word there is similar to the word here. Although it doesn't give the exact location until you find out where it is but in the case of the following sentences, they need to reach their destination.
Here is another simple sentence on how to use the word there.
Example;
Are we there yet?
That sentence is correct because they are asking if they are at the location they are destined to go.
Example of what not to do;
Have you seen there soccer ball yet? We have been searching for it for a long time!
Wrrooongg!
There can mean where can it be located. Therefore, it should be replaced with their or they're.