This article by Ryan Holiday offers a comprehensive and at the same time practical take on journaling: The Timeless Art of Journaling: How To Start Journaling, Benefits of Journaling, and More
journaling
Journaling
Keeping a journal of your thoughts on anything (not just the daily details of your life) or engaging in good online conversations are great ways of learning how to write with freedom and immediacy. You’ll be surprised how much turns out to be usable material.
— Gareth Branwyn, How to Be a Better Writer