[BOOK]
https://www.blendermarket.com/products/introduction-to-geometry-nodes—book
[PAPERBACK]
https://www.amazon.com/Blender-3D-Introduction-Geometry-Nodes/dp/B0C1JK84VM/ref=sr_1_5?crid=634ZJL2G2YPP&keywords=geometry+nodes&qid=1681832474&sprefix=geometry+nodes%2Caps%2C110&sr=8-5