I am using Online module creator to create a table in admin panel.
I added the sql query as needed to create the table but I don't know what to write in the field
Run Installing Php Code.
Please see the screenshot below for clear understanding
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I haven't used that module creator a lot but I assume that is the php code that is ran when the install script is executed. It can be useful if you want to create entity instances or you want to modify some config values or anything else that comes to mind. If you are just creating a module to manage some entities then you don't need to put anything in there.
But just to make sure, put something / anything in there, and when you download the extension you create then look in it's files and folders for the text you entered. If you identify the file you can get a better idea about what it does.