Image acquired here.
Do you want to build one or more worlds for your campaign, book or for fun? No idea where to start? Try the resources below. Keep in mind that a few links are 4chan threads, so they might include content that some people find offensive. Nevertheless, I included them because they provide valuable information.
1) http://www.web-writer.net/fantasy/days/days/01.html
A guide for building a fantasy setting.
2) http://arcadia.net/Cruinne/DnD/Articles/worldbuilding.html
A checklist for an elaborate setting.
Bestiary
3) https://abookofcreatures.com/
Website dedicated to documenting and drawing creatures from all ov