Where should the tzitzit be attached to the 4-cornered garment? How long do tzitzit need to hang down? But they don't have a measure... or at least not as long as they are long enough to count as being "strings." A point upon which Beit Hillel and Beit Shammai agree. Plus, is there a blessing made upon tying tzitzit or only upon wearing them? Also, diving into the details of the dying of tekhelet and its rules. Plus, the need for expertise - and just how special the tekhelet was.