InDesign accessible tag/tagged PDF question

When i create the tag in InDesign, what is the difference i ceated the tag unter the"Tag"tab and under the paragraph style-"export tagging"? should i just do one of them is enough? or i have to do both of them if i want to make an more accessibile pdf?
and when i export the file, should i only export it to interavtive pdf? or print pdf is also work?
Thank you.
