I'm looking for a PDF application that I can use to write notes in PDFs and then save them without having to buy such an expensive Adobe thing. Theoretically, I also have a touchscreen on my laptop (Windows 10), but would definitely (!) Prefer typing. As part of my training (full-time school education) I use my laptop a lot in class and save PDFs on it that we receive from our teachers for the lessons and would find it clearer to be able to write the notes directly in the appropriate place and not separately in extra documents. I would like it best if I could simply download an app and set it as a standard application.
https://pdf.iskysoft.com/de/edit-pdf/free-pdf-markup-tool.html