MacProVideo and Ask.Video are the same library of courses [which includes Audio, Video, Graphics, Productivity, and Web topics], while Ask.Audio is focused on audio topics. This forum -- accessed from either page -- is for discussion related to those topics, and the tools/software used in audio/video/etc production. The course library is a resource that offers more in-depth video on topics that could benefit from visual explanation and graphic demonstration that can go beyond a text forum.
Ask.Audio is an online magazine with a searchable collection of articles on audio topics, and is connected to Ask.Audio Academy, which offers the audio courses from the other sites.
Since this forum is accessed from the MacProVideo and Ask.Video websites, many posts probably focus on topics related to the courses [a pretty broad collection of software tools for audio/video/etc production]..