For fly tying you can go to the homepage and "click" on Fly Tying and then "click" on Tying Terms. There you will find everything you wanted to know about fly tying and the words used and what they mean.
For fly fishing you can go to the homepage and "click" on Flyfishing Basics and then "click" on Flyfishing 101.
Lots of good material in both of these and all brought to you by FAOL. The best site going for fly fishing and tying.