Making a PDF document

I have a task to make a PDF file about using Linux from my teacher. What program do I need to use, and do I need to format the file I make to PDF?

LibreOffice (or OpenOffice).

There is an option "export to PDF" in the panel of Libreoffice:

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If your document is a simple/regular text (not highly formatted), as an alternative to LibreOffice we got a lot of different ways to do this.

Let's say we don't have LibreOffice installed, and we're not aware of any third-party tools.

Drag and drop your text file to a browser (e.g: Firefox). Press Ctrl + P, then print it into a PDF file:

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This is worth to mention too: How to print a regular file to pdf from command line

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