Any HTML tag (field): you can enter any tag that you want to remove in a comma-separated list. IMPORTANT: if you choose a tag that has child elements, those child elements will be removed along with the parent.
Empty tags checkbox: means empty <div>...</div> rather than empty elements liks <img> etc
Custom data attributes (field): or, in fact, any attribute that is hyphenated can be entered as a comma-separated list. This includes aria attributes
Other misc attributes (field): literally any other attribute that you want to remove. Enter in this field as a comma-separated list.