Re: filling out forms in PDF.
Yes. Filling out PDF forms either stand alone or online works fine.
While not as fully functional as Adobe Acrobat, the tools available in Preview and Safari will allow you to also edit and change PDFs. You can even combine PDF files by drag and drop.
Wow. I am definitely going to show this to my husband. He needs to become a FReeper so he can post here. There’s the garage door...