There are a number of useful instructional videos housed on a server at the National Conservation Training Center (U.S. Fish & Wildlife Service). The videos, while still valid, are a few years old now, and likely will be updated or supplemented in the next year or two.
Some of these videos are the same as those housed in Vimeo with links listed elsewhere on electrofishing.net. Depending upon your connection, the Vimeo versions may have better resolution. However, to access videos on this list, you don’t need an account or password.