Dancing the Basic Step
As explained in Counting the Beats, dancing salsa is always based on the beat, and the basic movement is to step quick-quick-slow two times over the eight-beat phrase.
Only six of the eight beats are used: 1, 2, 3 and 5, 6, 7. Therefore, instructions will be given according to the 1, 2, 3 and 5, 6, 7 beat sequence.