Ah, yes. Hackle is classic material for a variety of wet and dry flies alike. I find myself being VERY frustrated when I tie a #6 4XL wooly bugger and the hackle is TOO SHORT or the hackle is not very good quality.
This article jumps in expecting you know things about tying flies so if you are a beginner, you may find yourself looking up things but that's how you learn so there should be no shame! It is a bit of a hard read, for me at least, because it seems a bit cluttered but nevertheless, it really has great info and tips. Maybe I'm just biased because I'm posting a lot of this stuff several days in a row. Oh well. I found it useful and I hope you guys do too!