once you get beyond square knots (used in surgery) or double half hitch knots (used in a macrame I once did), I don't know much about knots.
this video is a good instruction for those of you who want to know how to do knots.
many of these are known to those who sail on yachts or do climbing.
Then you have the problem of which rope (or suture material to use). Some are strong but slip, others don't slip but are hard to remove.
which suture to use is important in surgery, since an "absorbable" suture needs to stay intact until the wound heals. Non Absorbable suture is less fussy: When I was in Africa, we used single strand nylon fishing cord for the skin: cheap but you had to put in about 8 knots because it was stiff and tended to unravel.
there are lots of videos on youtube about the various types of ropes and which type is best for which use. but here is an article that discusses this.
as for macrame: Lots of videos out there but this is a basic how to video:
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