Dit is my eie boek.

A simple breakdown is:

• Dit = it / this
• is = is
• my = my
• eie = own
• boek = book

So the structure is very close to English: It is my own book.

Eie means own. It adds emphasis.

So:

• Dit is my boek = It is my book
• Dit is my eie boek = It is my own book

Using eie can suggest contrast or emphasis, like not someone else’s.

In Afrikaans, eie normally comes after the possessive word:

• my eie boek = my own book
• jou eie kamer = your own room
• sy eie idee = his own idea

So my eie boek is the natural order.
Eie my boek is not correct.

Because my already shows possession, just like in English.

Compare:

• die boek = the book
• ’n boek = a book
• my boek = my book

You do not normally put an article before a noun when a possessive like my is already there.

My is used before a noun:

• my boek = my book

Myne is used without the noun, more like mine in English:

• Die boek is myne = The book is mine

So in Dit is my eie boek, my is correct because boek is present.

Yes.

• Dit is my boek = It is my book
• Dit is my eie boek = It is my own book

Leaving out eie removes the extra emphasis, but the sentence is still completely correct.

A rough guide:

• my is not pronounced like English my. It is closer to may, though not exactly the same.
• eie is roughly AY-uh.

So my eie sounds approximately like may AY-uh.

If you are learning pronunciation, it is a good idea to listen to native audio, because English spelling can only give an approximation.

Yes. Dis is a very common contraction of dit is.

So these both work:

• Dit is my eie boek
• Dis my eie boek

Dis is especially common in everyday speech.

Not always. Dit can mean it, but depending on context it can also point to something like this.

For example, if someone is holding up a book and says Dit is my eie boek, the idea may feel like This is my own book in English.

So the exact English choice depends on context, even though the Afrikaans sentence stays the same.

Not necessarily. It normally means the book belongs to you, with emphasis on your own.

So my eie boek usually means:

• my own book
• a book that belongs to me

It does not automatically mean a book I wrote myself. For that idea, the context would need to make it clear.