For editing documents it is not necessary to have a license of Adobe
If we seek the ability to edit PDF files without necessarily buy a license of Adobe Acrobat Pro, the attention can certainly fall on Icecream PDF Editor, a free software installable version of 7 to 10 Windows.
Icecream PDF Editor is also available in Italian and describes how a very lightweight application that allows the addition of text, images, post-it, allows you to highlight the text already there or the one you just added, insert stamps, and much more.