Commenting is a conversation about learning in the blog. There are many steps to make a decent comment. Those are greetings, Positive comments, Helpful comments, Thoughtful comments, making connections, adding more information and asking questions.
The greeting is to start that comment.
The positive comment is to say something nice about that blog.
The helpful comment is what to improve on the blog.
The thoughtful comment is to say another nice thing about the comment.
To make a connection is to see if the blogger and the reader did the same thing.
Adding more information is just adding more on what to improve on.
The ask a question is just to ask the question to the blogger.
Commenting can improve writing.