If you're looking for some best practices related but limited to machine learning application code, you could have a look at Beyond Jupyter (https://github.com/aai-institute/beyond-jupyter)
Here's an excerpt from the readme:
"Beyond Jupyter is a collection of self-study materials on software design, with a specific focus on machine learning applications, which demonstrates how sound software design can accelerate both development and experimentation."
Here's an excerpt from the readme: "Beyond Jupyter is a collection of self-study materials on software design, with a specific focus on machine learning applications, which demonstrates how sound software design can accelerate both development and experimentation."