Books, documents, tutorials, how-tos, etc, are spread all over the web, as well as in schools, work places, governments, etc, documents being encapsulated in numerous file formats.
Sometimes, there are cases requiring certain file conversions, like for example, converting an x file to PDF, in order to satisfy user-specific needs, action easily performed via [LibreOffice][1].
Essentially, via LibreOffice **Writer**, the user is able to hassle-free convert books, documents, etc, to PDF, Writer permitting an easy conversion from every file open-able in Writer to PDF.
For example, converting a DOC file to PDF is as simple as:
- open the DOC file with LibreOffice by `right-clicking on it-->Open With LibreOffice Writer`
- navigate to `LibreOffice-->File-->Export` as PDF, action that summons a `PDF Options` dialog where (on-demand) the user can in-depth tweak the fields (dialog featuring a sane set of recommended default options)