While teaching how pieces move, the most difficult to explain and understand is the knight. This is because other pieces move in in straight lines and the knight is the only piece which can jump. Kids can usually grasp the point that knight can jump but still find it difficult to understand its movements.
The best way to teach anything is to keep it simple, interesting and if possible make it funny (a kind of trigger) so that kids can easily remember it. Here is one interesting and funny method. The founder of this method is one of my chess friends (Mr. Rushang) who is a chess coach and also a very creative person. Nowadays I am using this method very effectively and enjoy doing so.
Normally we have tiles on the floor. Then we ask one of the kids to come up and ask him or her to stand on any tile they like with their legs together and then jump two steps, one by one, still with their legs together. Once he or she has completed the second jump, we ask him or her to spread their legs to show where the knight came from and where it is now. Believe me, the is very funny and effective way to teach kids knight moves. Parents even told me that after my departure the kids would continue to play this game.
If you would like to use this method on a board then you can do it with two fingers together and the same process outlined above. But it is not as funny!
Teaching should not be stereotyped, you have to make it interesting.