Every stagehand should know, minimally, how to tie a bowline and a clove hitch. Link to site containing "how to" videos.
Other applicable advice: "If you can't tie good knots, tie plenty of them," aka "If you can't tie a knot, tie a lot!" (Be advised that this practice may result in the Technical Director or Head Rigger intentionally breaking your fingers.)
Other applicable advice: "If you can't tie good knots, tie plenty of them," aka "If you can't tie a knot, tie a lot!" (Be advised that this practice may result in the Technical Director or Head Rigger intentionally breaking your fingers.)