Let's start with homophones:

Your/You're-

Your: the possessive form of "you", generally used before a noun
EX.
Your eyes are a pretty color.
Your dog is cute.

You're: a conjunction of You & are, can be used in any situation where you would say "You are"
EX.
You're looking very pretty tonight.
You're a lovely young lady.

To/Too/Two-

To: used as a function word to indicate an action if some sort.
EX.
I had to go to the store today.
I needed to get some mascara

Too: excessively or also
EX.
This shirt is too big.
I like puppies too!

Two: The number two (2)
EX.
I've got two apples.
My baby brother is two years old.

Our/Hour/Are-

Our: the possessive form of we
EX.
Our house is purple.
Our teacher is the best!

Hour: A measurement of time (60 minutes)
EX.
This movie is an hour and a half long.
I have an hour before I get off from work.

Are: The plural form of the verb "to be"
Those apples are delicious.
Our cakes are the best you'll ever eat!

There/Their/They're:

There: In, at, or to that place or position; also used to focus attention on something and express satisfaction or annoyance at it.
EX.
Go sit over there.
There, I told you the sky was blue!

Their: Possessive form of "they"
EX.
That's their ball.
The class didn't finish their homework.

They're: Conjunction of they & are, can be used in any situation where you would say "They are"
EX.
They're a big bunch of bullies
They'd better get it together or they're going to fail chemistry.

its/it's

its: possessive form of "it"
EX.
The dog chased its tail for hours.
My cat refuses to use its bed and instead sleeps in mine.

it's: conjunction of it & is, can be used in any situation where you would say "it is"
EX.
It's been a great day!
Thanks for the games, it's been fun!

Through/Threw-

Through: Moving in one side and out of the other side; also continuing or valid to the final destination
I went through the doorway.
A through train to Manhattan.

Threw: Past tense of throw
EX.
I threw the ball to him.
He threw a tantrum like none other.

Bored/Board-

Bored: Feeling weary because one is unoccupied or lacks interest in one's current activity.
EX.
I'm bored.
I bet you're bored too.

Board: A long, thin, flat piece of wood or other hard material, (as a verb) get on or into
EX.
This is a heavy board.
We boarded the plane at 8 am.

Effect/Affect-

Effect: A change that is a result or consequence of an action or other cause, to bring about
EX.
Nausea is a common side effect of this medication.
This effect is caused by adding dry ice to water.

Affect: To have an effect on, to pretend to have or feel something
EX.
Your diet can affect your general health.
As usual I affected a supreme unconcern.

You know what? I'm done...Imma let Larry finish this one for me :)