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The most professional PDF software is PDF editor apps. When you need to replace an image, change the text in a PDF, add new form fields, or edit anything else in a PDF, they're the apps you need. They can also create new PDF documents and forms from scratch
If you want to tick answers on a PDF form, the best choice is to add checkbox to PDF. You may think of copying a checkbox online and pasting it on the PDF form. That may be a solution, but there is a much easier and more professional way to insert a checkbox in PDF
You use annotation and drawing markup tools to add comments. Comments are notes and drawings that communicate ideas or provide feedback for PDFs. Text-editing tools let you add editing marks to indicate changes that you want in the source document