At the risk of sounding cocky or patronising... take your pick
The animated knots site is great to learn a new knot, but let's be honest you only need a few for fly fishing..... I'd suggest rather than faff about streamside looking up knots, you get an old spool of tippet out and practice the few you need at home, do it 10 times and you won't forget. Let's face it streamside isn't the place to be trying new knots or reminding yourself how to tie them, you should be really sound in your tying on the river... that way you are unlikely to get break offs due to p!ss poor technique