The practical test automation examples are often the ones you can learn the most from in the shortest time. Here's a good one by Ravisuriya Eswara.
Fixtures are very helpful to set up test preconditions and make a test more readable. Willian Policiano shows a great example of implementing this pattern.
Might not be news to many but it's a great reminder from Dan Edwards about how important role software architecture plays in making code more testable on lower levels of the test pyramid.
Also, Agustin Pequeno shares the lesson learned about Avoiding the test hourglass based on their own experience.