Hello thanks for looking at my question,
I am concerned with the last knot on the zizit. does it matter how its knotted? It has to be double and I heard that one knot has to be opposite the other.
The last knot on the tzitzis should be a double knot. The reason for this is because a single knot comes out easily, and isn’t considered “tied”. I am not familiar with this idea that one knot has to be opposite the other.
Shulchan Aruch 11-14.