@emp217 No clue. I don't know what tutorial you are talking about. With just F and B knots your strings will all move forward or backward. The FB and BF knots keep them in the same lines they are in.
@Traveler: I saw a tutorial on YouTube in which there are only f or b knots. Is there any difference? I can't see any. Maybe with string order at the edge?
This is a pattern for the knitted zigzag bracelet. To make it, knot from left to right when doing the fb knots and from right to left when doing the bf. Ignore the gaps and make the rows all touch.
To adjust, add or subtract more rows to each section of the pattern if you want the zigzag longer or shorter. Add or subtract strings to make the bracelet wider or thinner.