What topics can I ask about here?
In general, Computer Science Educators Stack Exchange is a place to ask questions about how to teach concepts in computer science, computer organization, or software engineering. Generally, these are questions about teaching in a classroom, but this is by no means a requirement. People teach in many environments, and any questions about teaching CS are on-topic here.
Even questions about how to self-teach are allowed, but be careful that the question is not just asking about the topic itself. Such questions may be on-topic at our sister sites, Computer Science or Stack Overflow.
If your question is not specifically on-topic for Computer Science Educators Stack Exchange, it may be on topic for another Stack Exchange site. If no site currently exists that will accept your question, you may commit to or propose a new site at Area 51, the place where new Stack Exchange communities are democratically created.