A List of useful Websites I have found over the years (some might already be known but Idc):
Storyteller's roadmap: a useful guide for writers in three different stages -> planning, writing, revising
writing realistic injuries: as it says. A useful guide to write em properly.
TheBump.com: typical naming website but also provides the origin and meanings of the names. Useful for extra research.
In different languages.com: you can look up a word and it will spit out every variation in all languages. Though it only works for singular words and does not show multiple versions of a word like Google translate would.
Springhole.net: A collection of Outfit generators.
Colorhexa.com - color names: as the name says, it shows a list of all colors by name and hex.
Britannica: has obviously a lot of stuff on it but this refers to the list of ancient civilizations. (Sadly it has a chatbot now so... )
Family education.com - baby name search: basically a name generator with filters for meanings, origin etc.
Behind the name.com: as it says, it can be used to find out more about a name and uncover it's history etc.
Family search.com - surnames: as it says, can uncover the meaning and or origin of one's surname.
Sfwa.com - fantasy world building questions: everything one could ever know about the world they build. Extremely useful, though not required. That just depends on the type of writer that you are.
Tabletop audio.com: Ambience audios for any ocassion.
Creative uncut.com: library for game design, concept art and more. Also excellent for character references.
Character design references.com: another amazing collection of art, interviews and more.