Every religion has a piece of the puzzle but none has the whole. Sitchin puts truths together as he goes through his life to show a bigger picture of our hidden histories. If you’re curious about the ancients then this is a great place to start

I recommend copy and pasting to your browser because Reddit won’t save save your place when you exit

Anunnaki Chronicles - Summary of his work, best to start with because it’s easier to read. Assembled by family after his death - https://archive.org/details/anunnakichronicl0000sitc

The Earth Chronicles. Written by Sitchin himself this is his life’s work that pieces together common elements in various religions, records, and archaeology. Reads as an academic work

The 12th Planet - https://ia804700.us.archive.org/24/items/B-001-000-340/B-001-000-340.pdf

Stair Way to Heaven - https://archive.org/details/B-001-001-080

The Wars of Gods and Men - https://archive.org/details/B-001-001-081/mode/1up?view=theater

The Lost Realms - https://archive.org/details/lostrealms00sitc_0

Genesis Revisited - https://archive.org/details/B-001-001-107

When Time Began - https://archive.org/details/whentimebegan00sitc

The Cosmic Code - https://archive.org/details/B-001-001-076

The End of Days - https://archive.org/details/B-001-001-077

Divine Encounters - https://archive.org/details/B-001-001-122

Full physical editions - https://a.co/d/ewoGlTF