Learning and remembering how to tie knots are what we call “perishable memory”. Good graphical apps help learn and remember many knots.
Grog Knots is effective with good graphics that allows you to step through how to tie a knot. 3D Knots is a great app in that it shows how to tie knots in 3D. You can rotate the knot as it is being tied. There is a side bar that allows you to change the speed as the knot is being tied. You can also eliminate the wording providing a full screen view.