Has anyone figured out how to convert PDF to text document?

I need to turn a PDF into an editable text document for a class assignment, but copying the text leaves out some sections. Has anyone else run into this?

Honestly, if sections are missing when you copy, it’s probably a scanned PDF so that text is really just an image. Try opening it in Word or uploading it to Google Drive and opening with Google Docs, both will try to convert it for you. That’s what I do at work with old scanned drawings.