Showing possession is one of the easiest grammar points in Japanese, yet one of the most important. All you have to do is add の after whoever it is that possesses the object.
That’s my book.
Where is my cell phone?
Those red shoes are mine.
I got it from my girlfriend.
The の is not limited to simply showing that it is mine, but can also show that it is his or her things as well.
Did you catch that last part? We used の after 黒い to show that the possession was on the black notebook, but can adjectives really possess objects?
You can add の to an adjective to show that are talking about that particular one.
Which do you like?
I like the red one.