How to make an extended body in fly tying

Tutorial to show how I make most of my extended bodies in fly tying. There are of course many other ways of doing it. This is just how I like it.
It's quite long and in three parts.
Part I is the basics with foam and feather
Part II is deer hair
Part III is "advanced" deer hair
The english is quite bad but I hope you get something out of it.
If you have questions or suggestions, please write in the comments section!