You can use a notebook, journal, google doc or a piece of cardboard it doesn't matter. This isn't anything you haven't heard before, I caught myself slacking off in this regard recently and was reminded of just how remedial the practice is. Especially in today's era with so much happening, it's a great tool for documentation and reflection. I've gained substancial personal development in several areas of my life just from writing once a week and re-reading past entries allowing me to evaluate my own thoughts. Give it a try if you haven't already. Stay well kings.