As much as we would love to see well maintained Community Wikis on learning resources we unfortunately had to realize that in general such questions are not a good fit to the question & answer model of StackExchange sites:
Whenever opinion based questions arise we inevitable will be faced with a big list of unsorted answers. This makes them almost impossible to maintain. Often good answers will appear on the bottom side of such a list only. They will not draw enough attention to get upvoted for pushing them further up. Therefore we decided to not allow such questions and recommend to close them as "primarily opinion-based".
Still, we do as an exception have some big-list questions open for additions whenever somebody feels they have something important to contribute. These questions mostly will be "protected" to avoid spam or poor answers from new users.
For a better access to learning resource recommendations user Gigili adapted a "master" question from other sites. This question includes a TOC to make answers easier to find.
The question and all answers are "Community Wiki" to ease maintenance, and to let everybody contribute by edits. Whenever we feel a resource or topic is missing we may add it to the TOC at the bottom of the question, add our contribution to an existing answer, or write an own answer there.
Having such a general question on "learning resources" also means that future questions on this topic will likely be closed as a duplicate to this question.