If you need a solution to a knotty problem, you should check out these knotty websites. While knots can be shown in diagrams, for some of us it may be easier to also see them being tied in animated form, and that's where these sites come in.
There are more knots out there than you might think, and it's probably a testament to many generations of bored sailors that so many variations actually have recognized names.
The above also has a YouTube channel
There are also apps for mobile devices too, of course: