One of the easiest, more effective methods of working spellcraft is the use of knots. You can use just about anything from thread, yarn, to ribbons, to even ropes, and spells vary in their use and function;
Store magick- You can create knot spells to store magick evoked during full moons, or special moments, or times when you’re feeling confident and powerful. Bound into the knot, you untie to release, and use during moments when your energy might not be at its best.
Binding the negative- I think the first thin people think of with binding spells is binding another’s magick, but I don’t bother with messing with another’s magick. I bind negative things like bad habits, destructive emotions, and even worries. When casting this type of spell, you infuse each knot to work that negativity into it, and then you burn the thread. That ashes are cast into moving water away from you (Water represents emotion and temperance).
Storing amulets and magical items. Knots are also useful with adding magical beads and amulets to keep on your person. You can make things like key chains, necklaces, bracelets, etc to hold your items.
Making your own cords to wear also enhances their power.
What type of medium for knots:
Hemp Jewelry- Provides instruction on how to make two different styles for bracelets or necklaces from Hemp cord, but you can use yarn, cotton twine, ribbon, or any string. While weaving, chant or use spell prayer visualizing your wishes into each section.
Spell of Nine Knots- is a very old, useful, and practical type spell.
Witches Ladder (craft)- very useful article on how to make including tips, and a note about using certain feathers in crafts.
Cotton twine, silk ribbon, and natural yarn also works very well.
Types of knots:
I think most pagans/witches/wiccans do not get fancy with using types of knots, using the basic knot to bind or tie. However, consider learning special knots to be used with specific spell work.
Make your own rope belt- perfect to be used with dressed and robes.
You can find tons of instructions on types of knots and their uses, both practical and magical, and some are even for decorative uses. Just remember that any knot or weaving provides the magical person the opportunity to infuse with their intention and power.