Visit these websites and do some reading first:
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http://camping-field-guide.com/knot-tying.html
https://meritbadge.org/wiki/images/5/5d/Six-Boy-Scout-Knots.pdf
http://www.howjunction.com/knots-and-their-uses.html
http://www.lowtechmagazine.com/2010/06/lost-knowledge-ropes-and-knots.html