Now I consider that choosing n-n relationship or 1-n relation ship for them
I think that n-n is good option because I imagine that horror movie is 18+ film and horror film
So I can choose n-n relationship

CREATE TABLE Movie (
    movie_id INT PRIMARY KEY,
    title VARCHAR(255),
    release_date DATE,
    -- other attributes
);

CREATE TABLE Category (
    category_id INT PRIMARY KEY,
    category_name VARCHAR(255),
    description TEXT,
    -- other attributes
);

CREATE TABLE MovieCategory (
    movie_id INT,
    category_id INT,
    PRIMARY KEY (movie_id, category_id),
    FOREIGN KEY (movie_id) REFERENCES Movie(movie_id),
    FOREIGN KEY (category_id) REFERENCES Category(category_id)
);