Whenever I tutor people on their computer, I always tell them that there are five ways to do almost anything in Microsoft Windows, but there are no wrong ways.
When I pick a particular skill to teach, I choose the method that is 1. universal and 2. involves the least amount of steps.
There is one exception where I teach three methods. When I teach people how to use the scroll bar in a Window I think it is important to show the fast way, the slow way, and the way that moves up and down a list at "reading speed."
The slow way: Every scroll bar has a little triangle at the top and at the bottom. You can move one item at a time through the list by making quick mouse clicks on either on the top or bottom triangle. This method is great when you want to carefully browse through a list such as a list of "Smiths" in an online phone book.