Microsoft offers a short tutorial, with video, on how to use Word 2013, 2016 or Office 365 to open a PDF in Word: Edit PDF content in Word
Things to Know
As Microsoft points out, "The conversion works best with documents that are mostly text."
This conversion cannot handle sideways pages. Correct orientation before converting.
If needed, you can extract a single page (or section) from a PDF in PDF-XChange Editor to save as its own file, rotate, and convert.
This conversion cannot handle figures well, and will sometimes make mistakes with columns of text.