PDF Editing

DRM84 wrote:

What is the best application for pdf editing?

Best(?)

There are many PDF editors to choose from, here are a few examples.

Acrobat Reader / Adobe Acrobat DC

https://get.adobe.com/reader/

PDFpen / Nitro

https://pdfpen.com/pdfpen/

pdfExpert

https://pdfexpert.com/

Master PDF Editor

https://code-industry.net/get-masterpdfeditor/

Foxit Reader / Editor

https://www.foxit.com/

Wondershare PDFelement

https://pdf.wondershare.com/

I have used PDFpen for more than a decade.

It’s usually best to avoid needing to edit a PDF. Edit the originals. This as PDFs aren’t intended to be edited.

If you need some weird or incompatible PDF-based extension, check with Adobe, or the options listed above.