It's the same thing. If I were writing a blog about Websphere, the posts would be about things which I wanted to post about. I wouldn't want people posting their questions there unless they were about the thing which I had been posting about.
And it sounded like you wanted to hijack the blog to ask about things which you had questions about. So no, I would recommend that if you have questions arising from your study, you should ask them on Internet forums. Like this one, for example. That's what it's for.