This first part of the answer was written a lot time ago. I've now rephrased it in a more detailed way below:
I agree with some of the points of @I.M. answer, but, in my opinion, a link to our list of useful resources should appear in our on-topic page in the section "What topics can I ask about here?". I think that, instead of saying that requests for resources are off-topic, we should write something like "if you are looking for resources related to Italian language, please check if you can find them in our list of useful online resources before asking a question". One reason is that it may be some requests for resources that at that moment are not included in our list. For instance, have a look at this question on German.SE (maybe this is not a good example of on-topic resource request question and we could look for a better example, but it seems that it has been considered on-topic on German.SE). One could ask for something similar on Italian.SE, namely, podcasts with colloquial Italian, but we don't have anything like this in our list of useful resources. Another reason is that, in principle, this is a list of resources available online, so that it doesn't include other kind of resources such as books.
I agree that questions asking for advice, such as "what is the best tool for..." or "which is the best way to..." should be closed as off-topic for the reasons explained by @I.M. But maybe what we should do is to encourage users to write questions asking for resources in such a way that:
- the question is as objective as possible and the possible answers are not opinion-based;
- the question specify the purpose of the requested resources so that it isn't too broad.
The above answer was written a long time ago, so I will try to add some new thoughts about the argument.
I agree with what is said by @DenisNardin in a comment that this Meta site is not the place to host questions asking for resources. Other SE sites about languages have questions about resources on the main site.
If we decide as a community that some old or new questions asking for resources should be closed, what I think should be done would be that some "regular" (that is, non moderators) vote to close that questions. As a moderator, if I vote to close a question, it automatically gets closed: I personally don't feel comfortable with this kind of questions being closed with the votes of only one or two users of the site.
In my opinion, most questions asking for resources would be off-topic because they would be opinion-based or subjective questions where every answer is equally valid. But I think we should allow some of them if they fit the criteria I will try to explain (and that maybe should be reworded), as every language-related SE site does (basically, questions asking for something very specific, which not give rise to opinion-based answers or to potentially long lists in which every answer is equally valid). It seems too drastic to me being the only language-related site in which absolutely all resource requests are off-topic.
And, yes, I know it is impossible to write a "perfect receipe" so that applying it you will get to know if certain resource requests are or not on-topic. But, for this reason, the closing votes of the community are important to decide what to do in such cases.
Some ideas to modify our help page What topics can I ask about here?:
Remove "Requests for resources" from the list "please, don’t ask any questions about the following topics [...]".
Add a new section with the title "Can I ask for resources?" to explain to which extent requests for resources are on-topic. The contents may more or less be something like this (I took some ideas from the Chinese SE on-topic help page. All this can be reworded, of course):
The short answer is: in principle no, but it depends.
Subjective questions (asking for opinions, polls or, in general, "list" questions where every answer is equally valid) are off-topic on the main Stack Exchange sites because they do not fit the Q&A format. You may notice there are already some resource questions collected under the resources tag, but we are in process of closing most of these questions, as they don't fit the Stack Exchange format. In any case, we have set up on our Meta site a question about useful resources on Italian available online. You're free to add more material to it.
So if you do ask for some resources that are not included in one of the sections of the above mentioned Meta question, be very careful how you phrase your question. Open-ended, chatty questions are explicitly discouraged on the Stack Exchange network. As the "Real Questions Have Answers" post states
You should only ask practical, answerable questions based on actual problems that you face. Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page.
We're not saying that you should never ask for resources, but when you do, you should ask for something as specific as possible. Avoid vague or subjective questions like "What are some good books I can read to improve my Italian?" as they are going to be closed.
If you do have a chatty, open-ended question, visit our chat room. (I'm not sure if we can say this if no one or almost no one visits this chat room)
For instance, do you think that these questions, question 1,
question 2 and question 3, would fit these criteria so as to be considered on-topic on our site?
Idea of something to be added to the tag description or wiki of our resources tag:
Please, see this help page for details of which requests for resources are on-topic for this site.
We can even add
Resource questions are likely to be closed
to this description if you think this would be useful to users.