Is that Marge Simpson or Lisa? I know their names but have seen maybe 2 episodes of the show.

Back on topic: here's a general hint that comes in VERY handy. If you're not sure what to do, drop a villager on the crafting hut and see what is available for them to work with.

Another tactic I favor is reincarnation of deceased villagers. Others feel it is not worth the lavastones. They keep their learned skills when reincarnated, and for that I'll watch 20 videos.

P.S. I found I can only handle about 20 villagers at a time (ymmv), and today for the first time all my villagers are Master Gatherers!