As discussed in this question, we seem to have reached a way forward on compiling "big lists of resources for Latin learners" questions. In general we've reached a consensus that that's not what this site is about; at the same time, it seems like a good idea to have a few such questions for people who are new to studying Latin. The plan is to solicit suggestions for "most-needed resource questions," choose some of the most upvoted, and post them to the main Q&A with a banner explaining their unusual status.
Please reply, therefore, with suggestions for "most-needed resource questions," one question per answer.
Once a consensus is reached, a moderator will post the question on the main site (or explicitly ask someone else to do so). If you feel that a particular question has reached "consensus" status but hasn't been asked yet, feel free to flag it for moderator attention.