Widely considered the series' peak. Watch every episode here, though some guides suggest skipping episode 33 and 50 as they are standalone filler.
Below is a long-form guide for the overall Bleach watch order, covering the original series, movies, and the continuation. Watch Bleach - 005
Includes Episode 5. This arc introduces Ichigo's powers and the basic rules of the Soul Society. Widely considered the series' peak