(The owl house) is my favourite episode of tv series ofn Disney Channel.

People have corrected episode here but i think that you mean tv series instead

It is about a teaenage girl that travels in a world of witch and demons.

There will be a criminal witch, which is her teacher.

In this wold she finds a many new friends and learn reallys true magic.

The oOwl hHouse

A title will capitalize most words

("The oOwl hHouse)" is my favourite episode ofn Disney Channel.

Parenthesis are typically used to add information or clarification, not to highlight phrases.

It is about a teaenaged girl thatwho travels in a world of witches and demons.

There will beis a criminal witch, who is her teacher.

The rest of your writing is in the present tense, so this should be too

The name of the girl is lLuz and than s. She comes into this world will be feeling your dream and willdreaming to be a true witch.

Names are always capitalized.
Than: comparison. Then: sequence

This seems like multiple sentences, it's hard to see why the sentences are joined with conjunctions. I suggested a possible correct sentence.

In this world she finds a many new friends and learn reallys true magic.

"a new friend" = singular
"many new friends" = plural

(The oOwl hHouse) is my favourite episode ofn the Disney Channel.

It is about a teaenage girl that travels in a world of witches and demons.

There will beHer teacher is a criminal witch her teacher.

The name of the girl is lnamed Luz, and than en she comes into this world will be feeling your dream and willand her dream is to be a true witch.

In this world she finds a many new friends and learn really learns true magic.

(The oOwl hHouse) is my favourite episode of Disney Channel.

It is about a teaenage girl that travel in as around the world of witches and demons.

There will beHer teacher is a criminal witch her teacher.

The name of the girl is lLuz and than, she comes in to this world will be feelby entering your dream and will be a trues. She is a real witch.

In this world she finds a many new friends and learns really true magic.

(The owl house) is my favourite episode of Disney Channel episode.

It is about a teaenage girl thats travels in a world full of witch and demons.

There will beis a criminal witch who will become her teacher.

The name of the girl is lLuz and than she comes into this world will be feeling youto fulfill her dream and will bbecome a true witch.

I'm honestly confused by what you meant here?

In this world she finds a many new friends and learn reallys true magic.