I don't think learning to write blog posts is particularly different from learning to write anything else. To the extent that that is true, I'd refer you to Stephen King's book On Writing[1]. Specifically, one bit of advice from that book (loosely paraphrased) "the best way to learn to write well is to read a lot and write a lot".

The other book I'd recommend is The Pyramid Principle[2] by Barbara Minto.

[1]: https://www.amazon.com/Writing-10th-Anniversary-Memoir-Craft...

[2]: https://www.amazon.com/Pyramid-Principle-Logic-Writing-Think...

A great book that helped me was "On Writing" by Stephen King.

https://www.amazon.com/Writing-10th-Anniversary-Memoir-Craft...

Stephen King's rule is that the second draft of his book should be ten percent shorter compared with the first draft.

Source: his biography On Writing (http://www.amazon.com/Writing-10th-Anniversary-Memoir-Craft/...)

While I am not a big fan of Mr. King's fiction, his non-fiction book On Writing is excellent: http://www.amazon.com/Writing-Stephen-King/dp/0743455967

He goes into process of writing a book with razor sharp detail.

Maybe you will be as surprised as I was to hear the name Stephen King mentioned in the context of writing advice, but 896 Amazon reviewers can't be wrong:

Stephen King - On Writing:

https://www.amazon.com/dp/0743455967?tag=0596800673-20&c...;

This is what Roger Ebert said about the book:

"A lot of people were outraged that he [King] was honored at the National Book Awards, as if a popular writer could not be taken seriously. But after finding that his book On Writing had more useful and observant things to say about the craft than any book since Strunk and White's The Elements of Style, I have gotten over my own snobbery."

http://en.wikipedia.org/wiki/On_Writing