I could see a small use for the tag in asking questions related to usage or study of resources from a learner's perspective. Something like:
"Why do dictionaries not generally assign unique ID numbers to words/concepts, while a thesaurus would?"
I'm not really sure of the topicality of that question, but it's the best I can come up with right now. The point is, while I can't come up with a good question of that sort right now, I'm sure someone could. I wouldn't say that the tag needs to be blacklisted, since there are only 8 questions that use it. It's not like there's a flood of junk posts associated with it, so it's probably safe to let it stay for now.
Asking for resource suggestions/recommendations is explicitly off-topic.
Do note also that we have a Meta post with a fairly comprehensive set of resources. Any new questions that get asked about "what resources" should include a link to that canonical post along with the closevote.