I write in it everyday. I start usually by whatever is my head at the moment, and if not then I write about my day, and if it deviates to a thought more elaborate or some reasoning then great!
I often write about how productive I've been that day and my relationship with my productivity, as well as my closest relationships and how I see myself.
I pretty do, I dont make a massive thing of it. Sometimes I just write it was an okay day, or the sun was out, something small. If i dont write in my journal i attempt to take pictures. And use that as a reference to how my day went.