
'What was the beginning, or how did things start? What was there before?' The Prose Eddais the most renowned of all works of Scandinavian literature and our most extensive source for Norse mythology. Written in Iceland a century after the close of the Viking Age, it tells ancient stories of the Norse creation epic and recounts the battles that follow as gods, giants, dwarves and elves struggle for survival. It also preserves the oral memory of heroes, warrior kings and queens. In clear prose interspersed with powerful verse, the Eddaprovides unparalleled insight into the gods' tragic realisation that the future holds one final cataclysmic battle, Ragnarok, when the world will be destroyed. These tales from the pagan era have proved to be among the most influential of all myths and legends, inspiring modern works as diverse as Wagner's Ring Cycleand Tolkien's The Lord of the Rings. This new translation by Jesse Byock captures the strength and subtlety of the original, while his introduction sets the tales fully in the context of Norse mythology. This edition also includes detailed notes and appendices.
This is a good selection from above: https://www.penguin.co.uk/books/53454/the-sagas-of-the-icela... (notably missing: Njal's Saga, but that's also available separately).
There are more sagas, though. Just not of the Icelanders.
For example the saga of the Volsungs.
If you are interested in general norse mythology then yes, Gaiman's book is really nice. The Prose Edda and the Poetic Edda are primary sources and not a difficult read.
Everything I mentioned (except Gaiman's) is published by Penguin and is a good translation.
Deep Work by Cal Newport - Could be summed up in a blog post. 3/5 (for the message; lower otherwise - maybe 2-2.5/5)
Fanatical Prospecting by Jeb Blount - Could be summed up in a blog post, but I think he makes a point on cold calling - if you need to do it, suck it up and do it. And that about sums it up. 2.5/5 (message is decent and he does offer some tips)
Rendezvous with Rama by Arthur C. Clarke - Liked it, but unsure that I'll continue. 3.5/5.
White Fang by Jack London - Enjoyable and descriptive. Had to power through, though. 3.5/5
Treasure Island by RLS - Absolutely loved it. Now I need to power through the 800ish episodes of One Piece. 4/5
King Arthur and his Knights of the Round Table by Roger Lancelyn Green - The story moves pretty fast. 4/5
Genghis Khan and the Making of the Modern World by Jack Weatherford - Khan as a historical figure fascinates me and I enjoyed this book. Don't know if it's just me, but Weatherford does seem to handwave Mongol atrocities. 4/5
Genghis Khan and the Quest for God by Jack Weatherford - Again, enjoyable. 3.5/5
The Secret Garden by Frances Hodgson Burnett - Charming and enjoyable story. 4/5
Black Beauty by Anna Sewell - Pretty sure this is the first book I ever read that's written from an animal's POV. I liked it. 4/5
The Prose Edda by Snorri Sturluson (Penguin Classic) - I really liked it. Helped me understand a bit more about Norse mythology. 4.5/5
Rejection Proof by Jia Jiang - I read this earlier in the year; it's about a guy who asked people ridiculous things in an effort to see if they'd say yes or no. I believe the thesis boils down to "Don't be afraid to ask; people say yes more often than you think." Was an enjoyable read. 4/5
My Antonia by Willa Cather (Oxford World Classic) - Really good read and not that long of a book. 4.5/5.
Apollo 8 by Jeffrey Kluger - As the title implies, it's about the Apollo 8 mission. Same guy who wrote the biography on Neil Armstrong. 3/5.
Just So Stories by Rudyard Kipling - Charming short stories that Kipling told his daughter until she died. 3.5/5
The Adventures of Tom Sawyer by Mark Twain - Was assigned this in high school but didn't read it then. Read it now. I missed out; it's a good book, but I think it's relatively boring until Tom starts going out with Huck a bit more. 3.5/5
The Wind in the Willows Kenneth Grahame - Best book I've ever read on friendship and its importance. 4.5/5
Only surprises for me were Apollo 8, which I didn't like as much as I liked the Neil Armstrong biography; Tom Sawyer, in that I liked it; and that Deep Work and Fanatical Prospecting seemed a lot more bloated than they should've been. Besides that, I'm happy I didn't read any books that I didn't like, but I suppose I didn't take many risks either.
Similarly, I'm currently reading through the Poetic Edda. I thought I had a decent grasp of Norse mythology, but I am clearly missing references left and right. (I know, because they are footnoted) I think reading the Prose Edda with its background first would probably have been helpful.
History is the only source you need. It would have been considered heresy to to otherwise, and it was common at the time for Christian scholars to reframe pagan gods as wicked sorcerers or demons and the like. In the Prose Edda, Snorri Sturluson states the gods are human descendants of Trojan heroes. It's also likely the descriptions of "light elves" and "dark elves" (basically angels and demons) along with Ragnarok (Apocalypse) and Baldr's death and resurrection (Christ motif) were retooled if not fabricated entirely to turn these 'dangerous pagan lies' into useful Christian metaphors.
Unfortunately we'll never know how much was changed, but we can be absolutely certain things were changed.