Similar to its shonen rivals Naruto and One Piece, the long-running Bleach anime is notorious for having frequent filler material. Roughly one-third of the Bleach anime is nothing but fillers, with a few episodes being filler/canon hybrids. For more casual anime fans, it's no problem to watch everything, filler and all, but story-focused fans would rather cut the fluff.
Source：https://www.cbr.com/bleach-guide-how-to-watch-without-filler-episodes/
