Question

how did venom won against riot and carnage what is the technique​

Answer 1

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So as Carnage wraps his symbiote tendrils around Dylan Brock, he gives Eddie a choice: let him kill the boy, which might not be enough... or Eddie kills Carnage, absorbing his symbiotes to make sure he stays dead, and merging more than enough to awaken Knull.

Answer 2

Answer:

After a long fight, Venom finally beats Riot by leaking the rocket's fuel and engulfing the entire ship in flames. Fire is one of the main weaknesses of symbiotes in the comics, and while the movie focuses more on sound, it's clearly true in the movie too - Riot is engulfed and presumably killed.

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