The initial Venom comic was 'The Amazing Spider-Man #298'. It marked the beginning of this popular character's comic book journey. Since then, Venom has become a fan favorite.
The 2018 Venom comic is pretty good. It has interesting character developments and some cool action scenes. However, it might not be for everyone. You should give it a read and decide for yourself.
Venom belongs to the Marvel Universe. DC has its own roster of characters, but Venom isn't among them. Marvel has developed the Venom storyline and character over time.
The Venom movie is grounded in the Venom comics of Marvel. These comics provide the foundation for the characters, plot, and overall world-building seen in the movie.