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…
The first part of "On Writing" is fantastic, in the sense that it tells you through King's own life that there are no shortcuts: you must learn by writing. And sometimes, you'll have people to criticize what you wrote, and that'll be the best thing.