When I first began to think about and research The Blood Samurai Series I came across a fantastic resource of all things samurai on The Samurai Podcast from the guys of the Samurai Archives. They very quickly helped liberate me of so many myths about the samurai, and I highly recommend it to anyone serious about digging into samurai history.
But if you only have 5 minutes to spare, check out this video on the top 5 myths about the samurai instead.