Because the English physical editions are rare and expensive (often $50-$150 used), many fans turn to scanned fan translations. A word of caution: While "Naruto Databook PDF" is a popular search term, many downloads on unverified forums contain malware or low-resolution, unreadable scans.
The glossary sections of the PDFs provide deep dives into Jutsu. They list the rank of a technique (E-Rank to S-Rank), the type (Offensive, Defensive, Supplementary), and the range. A fan might discover that the "Shadow Clone Jutsu" is actually a B-Rank Kinjutsu (Forbidden Technique), a detail easily missed in the anime but highlighted clearly in the databook text. Naruto Databook Pdf
The Databooks often include detailed maps of the Ninja World (showing where the Hidden Villages are relative to each other) and timelines of the Great Ninja Wars, which helps clarify the history between the Senju and Uchiha clans. Because the English physical editions are rare and
If you are a lore enthusiast or a fan of "power scaling," a is an essential resource. It fills in the gaps of the world-building that the main story didn't have time for. However, take the "combat stats" with a grain of salt, as characters often outgrow their databook rankings as the story progresses. They list the rank of a technique (E-Rank