I want to create an ai using no plugins, I realize it would be impossible to make a fully fledged AI, I just want help creating an AI that can detect what the user is talking about and give a simple explanation of the topic.
Example:
User: What is a dog?
AI: A dog is an animal and a popular pet choice.

so the best AIs on scratch use a lot of If statements: https://scratch.mit.edu/projects/228155796/
Normally you use an if block along with if the answer contains dog then: respond like what you said

Hope it helps! You can browse a lot of project with good AI code by searching AI on scratch