how to secure an application using the React - REST - Symfony stack with an AI using Heuristics?

Hi all, I have a problem to solve and I ask for your help, I work on the web - mobile development of the following e-learning application: (lefax.cm) with React REST Symfony4 for React, for security reasons I must integrate a heuristic-based artificial intelligence to do it and there I wonder how to orient my choice. Thanks