What is a free program to edit PDF files?

Question

PDF

The customer sent a pdf contract, you need to edit the little things, add my name and other data.
What is the best free program to edit pdf files?

Answer 1

Ask them to send the original document in .docx, for example.
pdf can be edited, but usually they still export to it.

Answer 2

PDF is not meant to be edited.
This is the final format.
Editors are crooked and more and more often corrupt PDFs than they edit them. Only the most primitive files can be fixed.

Answer 3

PDF Architect. He's really paid. but cheap. If you install the program and then remove it, the browser opens and you get to a page with a special offer, where a license for 3 computers for a year costs 19 euros.