The series of articles "Writing a Blog Engine in Phoenix and Elixir" [1] can be quite fast-paced at times, but in the end (and far before that, too) you'll have a blog platform that you can use and you'll understand how some of the different Phoenix & Elixir pieces fit together.

For a more thorough experience, however, I would absolutely recommend you to have a look at the books the Elixir community has produced. As you're specifically asking for tutorials (and not other sources for learning), my best recommendation would be Programming Phoenix [2], a book written by the creators of Elixir and Phoenix.

The book is structured so that most of it is focused on building one specific web application, so you can follow along from start to finish and build something far more interesting than just a run-of-the-mill blog (and learn a lot about Elixir and Phoenix in the progress).

[1] https://hackernoon.com/introduction-fe138ac6079d [2] https://pragprog.com/book/phoenix/programming-phoenix