I wouldn't recommend that you blindly ignore warnings. They are there to indicate possible issues with your code. As long as you understand why a given warning is being issued, you can make an informed decision regarding whether it's important to you or not.
The specific warning you mention is just telling you that your
onArea2Dbodyentered function has an input argument (
body, which is the body you collided with) that you're not using in the function. That's not really a problem if you don't need it for anything. So, again, just understand the warnings and make appropriate decisions.
You can tune the various warnings issued by Godot in the Project Settings. Specifically Project Settings | Debug |GdScript. There you can disable all or specific warnings and errors, though I wouldn't recommend you do that.
For details, see:
Additionally, you can disable specific warning/errors in a given source code file using a number of directives. Rather than going into the details, here's a link to a relevant discussion: