Deprecated Gradle features (Incompatible with Gradle 9.0)

I’m making a Minecraft fabric mod in IntelliJ, and everytime I try to run the Minecraft client it gives me [insert what the discussion is about] Also, I’m a new Minecraft modder so, uh yeah

So?
You are getting a warning that you use deprecated features that will make your build unable to update to Gradle 9 and also further instructions what to do.
What is your question?

I don’t know which features are deprecated

Follow what the error tells you and you will know.