I remember sites like [link] and [link] used to have good Flash tutorials, but that was years ago. You'll probably have to search for more specific terms if you're looking to replicate a certain effect, or master a certain tool.
Adobe flash is a dying format. There's no point learning it, because in a year or two everything will be in HTML5 and you'll have to learn everything all over again.
IMHO, much better idea to learn HTML5 now because it already works in most browsers and is better than flash in every possible way. Flash is simply not worth it at this point.
A small concession: If you need to learn it to use it in an existing project that already uses Flash, then ok, then you have no choice but to learn it, but there's no point in starting any new projects in Flash because it's totally unnecessary.