Just as we are not here to do philosophy, StackExchange, in general, and Philosophy.SE, in particular, is not a good place to learn a subject.
StackExchange has a very concisely defined purpose: Developing a database that gives objectively "correct" answers to a given question in a given subject. Correct should here be understood as appropriate according to the pragmatic need expressed in a question.
As of learning philosophy, this is a bit ambiguous. What should this mean? Learning to discuss philosophical questions? Learning how to read a philosophical text? Learning how to write a publishable paper? None of this can be provided simply by reading texts.
And how can the question "How can I learn philosophy?" have an answer that is not incorrect either because it is overly general or overly omissive?
Nevertheless, there are quite a few questions on this site that are about learning philosophy in a sense: Questions about introductory texts to philosophy in general or particular topics, questions about texts crucial to read for a broad overview, and many more.
To explicate the point made above: Philosophy, more than many other subjects, is a subject that lives through discourse, both "living" - in seminars, lectures, and conferences - and "dead" - in books and papers. Learning philosophy involves learning proper argumentation, identifying fallacious arguments, discussing the rules of a discourse, and - first and foremost - learning about all the arguments, objections to these arguments, and counter-arguments against these objections that have already been given on a given topic.
Why? Because humility based on the insight that almost any topic has been discussed with better arguments by much more knowledgeable people and in most cases long ago is one of the most fundamental things to learn when learning philosophy. Academic philosophy does not cite philosophers that are long dead because it looks good and is expected, but because pretending that nobody before me had this (more or less) ingenious idea is an expression of ignorance in like 99.99999999999% of the cases.
So, does Philosophy.SE miss something important for learning philosophy? Maybe, but it is also not its purpose to teach the topic. On the other hand, if one is willing to learn, what one needs the most are other persons helping to understand texts that are already there. And it is perfectly fine to ask questions about how to understand certain passages or arguments here.