Thanks for your comment.
If I am tying a fly(kebari) with the reverse hackle as in some of the sakasa kebari patterns, then I always tie off behind the hackle.
Usually I do it immediately after the hackle but before the collar, if I am adding a collar. That way it is usually possible to hide the thread.
A good example of that is this tying:-
Hends BL550 #12 hook
Uni-thread 8/0 pink
Grey partridge hackle
3mm tungsten bead pink
Hends 0.18mm pink wire
Veniards pink glister dubbing collar
Shetland spindrift oyster (290) wool
I always finish off with a wip finish, tied manually, as I feel I have better control over the placing of the whips and avoiding any stray hackle fibres.
If I am tying a fly with the traditional wet fly hackle then I would tie off ‘through it’ and tie off at the head immediately behind the eye. I generally use a whip finish tool in those instances.
However I would say to you to tie off the way you are most comfortable with. No fish is going to know the difference. Remember we tie to catch fish, not people. Quite often the scruffiest looking fly catches the most fish.
These days you can learn a lot from the numerous YouTube/Vimeo videos about.
As far as favourite colour - I have about 22 different Jamieson’s Shetland Spindrift wools and am just about to order a few more, including a new Oyster (290). However I have given a lot away!