The basic rule of the spelling bee is that when the host reads a word aloud, the contestants will begin to spell the letters orally. Participants can re-spell, but the letters or alphabetical order they have already read cannot be changed. As long as the contestants misspell one word, they will be eliminated immediately. The competition was held in rotation until the last player was eliminated.
As for why the English name of the spelling bee is "Spelling Bee", historically, social activities gathered for a certain purpose in the United States are often called "Bee", which comes from the meaning of "group gathering" and "rushing action", similar to "collective labor" in Chinese.
If you want to see a movie, I recommend the movie "The Curse" nominated by the 2002 Oscar for Best Documentary. It records the situation of the national spelling bee in the United States, and tells the experiences of eight children from different regions and different family backgrounds in the contest with as many as 90 million contestants.