Hello! If you want to know about Greek mythology, you should take a look at this post. There’s pretty much all I could think of for beginners.
If you want to learn about other cultures, I can think of a few things as well. Please know that it’s absolutely not exhaustive though; I’m not as well-read as I should on that matter.
- The Poetic Edda
- The Prose Edda, by Snorri Sturluson
- Icelandic legendary sagas
- La Morte d’Arthur, by Thomas Malory
- The Arthurian Romance, by Chrétien de Troyes
West and South Asia
- One thousand and one nights
These are my favourite, and those I know most about. Enjoy!