The Naruto anime series can be divided into three main story arcs:
Entirely standalone episodes or multi-episode story arcs created exclusively by Studio Pierrot. They have zero impact on the overarching timeline and can be safely skipped without missing central narrative developments. Part 1: Original Naruto Canon Episode List naruto episode canon
Assuming you are asking for a guide on which episodes of the Naruto anime are canon (based on the manga) and which are filler (original to the anime), here is the breakdown for both the original Naruto series and Naruto Shippuden . The Naruto anime series can be divided into
Naruto & Naruto Shippuden | List of Filler Episodes - Poggers Naruto & Naruto Shippuden | List of Filler
If you watch only canon, you save roughly of viewing time.
Shippuden intersperses filler throughout the series rather than lumping it all at the end, though it has several long filler stretches.