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