Mark Nelson with Rio Grande recently did a couple of short videos on Youtube, one explaining the different kinds of buffs and their uses and effects, and one on several Luxi compounds.
He covers which compound to use when, but he only covers a few of them. (There seem to be dozens.)
I'd been looking for something like that a long time and I found them both very informative.
I'd link to them here, but I'm not sure if that's ok or not.
A quick search should do the trick.