Hey for all people new to Hedgewars.
I did my best at a training video.

To view it, download:
http://m8y.org/hw/Training.hwd_29
Then copy it to your Demos directory, which is:
~/.hedgewars/Demos
under Linux

C:\Documents and Settings\YourUserName\.hedgewars\Demos
under XP

To play, click on Local Play, then the video camera icon in the lower right.

There are some typos, and I had to correct myself at a couple of points due to, I think, the boredom, but I hope it is helpful.