I got my first script rejected. If someone can describe the reasons i've added

Its my first Item submission and my script got rejected. Support sent me some reasons in eamil. But i’ve confusion on the below reasons -

  1. ITEM DESCRIPTION: Make sure your item description includes an accurate description of how editable or customizable your item is. Please list the file formats included. Any elements that appear or are used in the preview but are NOT in the download. Any outside assets, fonts, or resources used. Important: Please click the Save button prior to resubmitting your item.

— Where to add these information?

  1. Please separate all demo CSS from plugin CSS.

— I’ve all the demo CSS separated from Plugin’s css file. Yet asking it, so can someone show an example or suggest me how to do it?

  1. Please avoid generic rules/names in your plugin stylesheet.

— What “generic rules/names” meaning here? Please help me, show me a few examples.

Experts’s help required.

Thank you