I find these two videos by sargefaria helpful. My son watches them when we practice our knots.

Bowline and Fisherman's/Blood knots:

http://m.youtube.com/index?&desktop_uri=%2F#/watch?feature=fvwrel&v=avmVfvioXvk

Slip knot, Pressik knot and Trucker's Htch:

http://m.youtube.com/index?&desktop_uri=%2F#/watch?feature=fvwrel&v=LwBg30sKiR8
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