By the way, are we talking about editing PDF files or filling in PDF forms?
What's been mentioned so far would work for actually editing PDF files. But if you're just trying to fill in PDFs like are supplied by the IRS and many other organizations those can be completed in Acrobat Reader DC or any of a number of other PDF readers that support form filling function.
Adobe Acrobat for designing and editing PDFs is an expensive tool.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
Any idiot can face a crisis. It's the day-to-day living that wears you out.
~ Anton Chekhov