Help:How to cite
FountainPen.it is an open and collaborative project, like the more famous WikiPedia project. The site also uses the same license, the Creative Commons Share Alike (and also in this case a transition has been done from the GFDL so a double licensing for all contents before 2020 is still valid).
This means that all contents are copyrighted by their authors, but you can copy it freely, until you respect the terms of these licenses. You can find the license full text clicking in the box at the bottom left of each page and, for the images, also on their description page.
But as a brief summary, without pretense of legal validity, which remains bound to the full text of the license (if in doubt consult a legal) you must be aware the in case of reuse of the material published here, FountainPen, it must be explicitly cited as the original source (linking directly this site, or the page from which you material is taken) and that derivative work (web pages or other types of work) created from resources taken from this site must be released under the same license.
In particular this last condition means that the texts and images that you add to material downloaded from this site must be reusable by third parties under the same license (and for example added to this site).