I'm asked fairly often to recommend resources for studying or working with fairies, so I've tried to put together a list of my own favourites. This is by no means an exhaustive list but I feel like its thorough and it covers all my preferred go-to options, from books to online material. My own focus is Irish and secondarily Scottish, so the majority of my sources here lean into that, but I cast a wide net.
Books
I'm going to break the book section down into three parts: academic, folklore, and practice. Again this isn't meant to be every possible option, but the main ones I'd recommend, and a solid starting place. A warning though: the academic books are often expensive and sometimes difficult to find.
Academic
Anything by Claude Lecouteux, Simon Young, Katherine Briggs, or Emma Wilby.
Joshua Cutchin's work is good if you are looking for more modern material or crossover with cryptid and UFO beliefs.
Elf Queens and Holy Friars by Richard Firth Green
Scottish Fairy Beliefs by Henderson and Cowan
The Good People edited by Narvaez
The Exeter Companion to Fairies, Nereids, Trolls and Other Social Supernatural Beings edited by Young and Ermacora
Magical Folk edited by Young and Houlbrook
At The Bottom Of The Garden by Diane Purkiss
Strange and Secret Peoples by Carole Silver
The Secret Commonwealth and the Fairy Belief Complex by Brian Walsh
The Supernatural in Early Modern Scotland edited by Goodare and McGill
Elves in Anglo-Saxon England by Alaric Hall
Folklore
Books by Eddie Lenihan
Tales of the Wicklow Hills by Richard Marsh
Away With The Fairies by William Henry
Hildur Queen of the Elves by JM Bedell
Practical
The Fairy Faith in Ireland by Lora O'Brien
Anything by Daniela Simina
Elves, Witches, and Gods by Catherine Heath (Norse)
Welsh Fairies by Mhara Starling
And of course I have a wide range of books myself (as well as blogs, articles, and a youtube channel for variety)
Online Resources:
Videos
Kin Fables by Five Knights Productions is an excellent series of short independent films (fictional) with fairy themes
Dr. Jenny Butler gives a great interview on youtube about Irish Fairy Lore
There's also this short video of a modern fairy encounter that I recommend people watch.
Michael Fortune has a wonderful series of videos on Irish folklore, some of which focus on fairy beliefs. These are must watch in my opinion.
Ronan Kelly's Ireland has an episode 'Pat's East Galway Fairies' that also worth a watch.
You can find a short series of videos by Eddie Lenihan on youtube, as well as several older videos of varying quality, and I suggest watching them all. Lenihan is a well known story teller in Ireland and he has fought in the past to keep a fairy tree from being destroyed for the sake of a road.
There is also an excellent older documentary on the Fairy Faith which touches on beliefs in both Ireland & the UK as well as in Canada.
Fiction and Poetry
Charmingly Antiquated on Tumblr has a great comic about a university taken over by the Fey.
Five Knights Productions also has a graphic novel series titled Kin available online
Rosamund Hodge has an excellent short story online called 'A Guide for Young Ladies Entering the Service of the Fairies'
Lora O'Brien's 'The Fairy Lover' is a fascinating look at the Leannán Sidhe, and 'The Banshee in Italy' is worth a read for certain.
Author Jennifer Lawrence has several excellent pieces online including 'Tam Lin's Garden' and 'Rebuttal: The Faerie Queen's Reply' that represent good, modern takes on the story of Tam Lin
Non-Fiction
Professor Ashliman of the University of Pittsburgh has a very useful site called 'Folktexts' that I recommend people checking out as a solid online non-fiction resource
Another great non-fiction source is the folklore site Duchas.ie. There is a great deal of fairylore to be found there, although in fairness not all has been transcribed into English.
Another good option is Circle Stories on facebook, which doesn't post exclusively about fairies but has some really solid material on the topic interspersed in.
For those with a more British focus Alexander Cummins excellent series 'The Rain Will Make a Door' is a great option. On that subject I'd also recommend John Kruse's British Fairies website.
Beachcombing Bizarre History is a site that often touches on fairies and is very high quality material.
The website Tam Lin Balladry has collected and annotated various versions of the ballad of Tam Lin as well as several other fairy ballads. The notes on the texts are worth checking out alone but the collection of versions is impressive.
Academia.edu has an extensive amount of fairy material - far too much for me to list individually here, but I encourage people to check out articles there by Simon Young, Chris Woodyard, or Sabina Magliocco to start.
For the Norse based folks and for more practical material I'd suggest Seo Helrune
Audio Resources and Music
Bluirni Bealoidis has a great podcast focused on fairies titled 'Fairy Forts in Folk Tradition'
Motherfoclóir has a podcast episode 'Don't F*** with Fairy Forts' that's excellent.
The BBC program 'In Our Time' has an episode titled 'Fairies' that presents a variety of views on the subject
There's a large array of songs that could be recommended, of course, but below I'll offer a selection of some that keep with the more traditional views.
Heather Dale, "The Changeling Child' and 'The Maiden and the Selkie'
Mor Gwyddelig's version of Buain a Rainich is very good and bilingual.
There's also several good versions of Tha Mi Sgith or A Fairy's Love Song.
Coyote Run has a very good take on fairy lore with their song 'Finnean's Dance'
Some of the old ballads can be listened to as well such as 'Lady Isabel and the Elf Knight' and 'Tam Lin'.
I'll end with one of my favorites songs with a fairy theme, Finvarra's 'Kelpie/Cliffs of Moher'